How to reproduce: 
Public Class Form1

    Sub New()

        InitializeComponent()

        Dim barSeries As New Telerik.WinControls.UI.BarSeries("Performance", "RepresentativeName")
        barSeries.Name = "Q1"
        barSeries.LegendTitle = "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "Leg

        barSeries.DataPoints.Add(New CategoricalDataPoint(177, "Harley"))
        barSeries.DataPoints.Add(New CategoricalDataPoint(128, "White"))
        barSeries.DataPoints.Add(New CategoricalDataPoint(143, "Smith"))
        barSeries.DataPoints.Add(New CategoricalDataPoint(111, "Jones"))
        barSeries.DataPoints.Add(New CategoricalDataPoint(118, "Marshall"))

        Me.RadChartView1.Series.Add(barSeries)
        Dim barSeries2 As New Telerik.WinControls.UI.BarSeries("Performance", "RepresentativeName")
        barSeries2.Name = "Q2"
        barSeries2.LegendTitle = "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "Le

        barSeries2.DataPoints.Add(New CategoricalDataPoint(153, "Harley"))
        barSeries2.DataPoints.Add(New CategoricalDataPoint(141, "White"))
        barSeries2.DataPoints.Add(New CategoricalDataPoint(130, "Smith"))
        barSeries2.DataPoints.Add(New CategoricalDataPoint(88, "Jones"))
        barSeries2.DataPoints.Add(New CategoricalDataPoint(109, "Marshall"))
        Me.RadChartView1.Series.Add(barSeries2)

        Me.RadChartView1.ShowTitle = True
        Me.RadChartView1.ShowLegend = True
        Me.RadChartView1.LegendTitle = "Legend"

        Me.RadChartView1.Size = New Size(500, 150)
        Me.RadChartView1.ShowPanZoom = True

        'Me.SetupLineSeries()

    End Sub

    Private Sub RadButton1_Click(sender As Object, e As EventArgs) Handles RadButton1.Click
        Dim filePath As String = "..\..\exprotedChart2.png"
        Me.RadChartView1.ExportToImage(filePath, New Size(1000, 800), System.Drawing.Imaging.ImageFormat.Png)

    End Sub
End Class

Workaround: increase the size of the chart
Public Class Form1

    Sub New()

        InitializeComponent()

        Dim barSeries As New Telerik.WinControls.UI.BarSeries("Performance", "RepresentativeName")
        barSeries.Name = "Q1"
        barSeries.LegendTitle = "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1"

        barSeries.DataPoints.Add(New CategoricalDataPoint(177, "Harley"))
        barSeries.DataPoints.Add(New CategoricalDataPoint(128, "White"))
        barSeries.DataPoints.Add(New CategoricalDataPoint(143, "Smith"))
        barSeries.DataPoints.Add(New CategoricalDataPoint(111, "Jones"))
        barSeries.DataPoints.Add(New CategoricalDataPoint(118, "Marshall"))

        Me.RadChartView1.Series.Add(barSeries)
        Dim barSeries2 As New Telerik.WinControls.UI.BarSeries("Performance", "RepresentativeName")
        barSeries2.Name = "Q2"
        barSeries2.LegendTitle = "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1" + vbCrLf + "LegendTitle1"

        barSeries2.DataPoints.Add(New CategoricalDataPoint(153, "Harley"))
        barSeries2.DataPoints.Add(New CategoricalDataPoint(141, "White"))
        barSeries2.DataPoints.Add(New CategoricalDataPoint(130, "Smith"))
        barSeries2.DataPoints.Add(New CategoricalDataPoint(88, "Jones"))
        barSeries2.DataPoints.Add(New CategoricalDataPoint(109, "Marshall"))
        Me.RadChartView1.Series.Add(barSeries2)

        Me.RadChartView1.ShowTitle = True
        Me.RadChartView1.ShowLegend = True
        Me.RadChartView1.LegendTitle = "Legend"

        Me.RadChartView1.Size = New Size(500, 150)
        Me.RadChartView1.ShowPanZoom = True

        'Me.SetupLineSeries()

    End Sub

    Dim size As Size
    Private Sub RadButton1_Click(sender As Object, e As EventArgs) Handles RadButton1.Click
        AddHandler Me.RadChartView1.SizeChanged, AddressOf RadChartView1_SizeChanged
        size = Me.RadChartView1.Size
        Me.RadChartView1.Size = New Size(1000, 800)

    End Sub

    Private Sub RadChartView1_SizeChanged(sender As Object, e As EventArgs)
        RemoveHandler Me.RadChartView1.SizeChanged, AddressOf RadChartView1_SizeChanged

        Dim filePath As String = "..\..\exprotedChart2.png"
        Me.RadChartView1.ExportToImage(filePath, Me.RadChartView1.Size, System.Drawing.Imaging.ImageFormat.Png)
        Me.RadChartView1.Size = size
    End Sub
End Class

To reproduce:
- Set the position like this:
this.radChartView1.ChartElement.LegendElement.Alignment = ContentAlignment.TopCenter;

- Export the chart to an image, the position is not the same as in the application.

Workaround:
- Set the position manually:

this.radChartView1.ChartElement.LegendPosition = LegendPosition.Float;
this.radChartView1.ChartElement.LegendOffset = new Point(400, 0);

To reproduce:

radChartView1.AreaType = ChartAreaType.Pie;
 
PieSeries series = new PieSeries();
 
series.DataPoints.Add(new PieDataPoint(50, "Germany"));
series.Children.LastOrDefault().BackColor = Color.Red;
series.Children.LastOrDefault().BorderColor = Color.Green;
 
series.DataPoints.Add(new PieDataPoint(70, "United States"));
series.Children.LastOrDefault().BackColor = Color.Green;
series.Children.LastOrDefault().BorderColor = Color.Red;
 
series.DataPoints.Add(new PieDataPoint(40, "France"));
series.Children.LastOrDefault().BackColor = Color.Blue;
series.Children.LastOrDefault().BorderColor = Color.Yellow;
 
series.DataPoints.Add(new PieDataPoint(25, "United Kingdom"));
series.Children.LastOrDefault().BackColor = Color.Yellow;
series.Children.LastOrDefault().BorderColor = Color.Blue;
 
this.radChartView1.Series.Add(series);
radChartView1.ShowLegend = true;

Workaround:
            for (int i = 0; i < radChartView1.ChartElement.LegendElement.Items.Count; i++)
            {
                PieDataPoint point = ((PieDataPoint)series.DataPoints[i]);
                radChartView1.ChartElement.LegendElement.Items[i].Element.BackColor = Color.Red;
                radChartView1.ChartElement.LegendElement.Items[i].Element.BorderColor = Color.Yellow;
            }

Workaround: use a custom ChartPanZoomController

public class MyChartPanZoomController : ChartPanZoomController
    {
        protected override ActionResult OnMouseWheel(MouseEventArgs e)
        {
            if (!(this.Area is CartesianArea))
            {
                return base.OnMouseWheel(e);
            }

            if ((Control.ModifierKeys & Keys.Control) == Keys.Control)
            {
                IChartView chartView = this.Area.View;

                double zoomWidth = chartView.ZoomWidth;

                if (this.PanZoomMode == ChartPanZoomMode.Horizontal || this.PanZoomMode == ChartPanZoomMode.Both)
                {
                    zoomWidth += ((double)e.Delta / 1200d);
                }

                double zoomHeight = chartView.ZoomHeight;

                if (this.PanZoomMode == ChartPanZoomMode.Vertical || this.PanZoomMode == ChartPanZoomMode.Both)
                {
                    zoomHeight += ((double)e.Delta / 1200d);
                }

                zoomWidth = this.ClampValue(zoomWidth, 1d, 100d);
                zoomHeight = this.ClampValue(zoomHeight, 1d, 100d);

                double virtualHorizontalPosition = e.X - this.Area.AreaModel.LayoutSlot.X - chartView.PlotOriginX;
                double plotAreaVirtualWidth = this.Area.AreaModel.LayoutSlot.Width * chartView.ZoomWidth;
                double relativeHorizontalPosition = virtualHorizontalPosition / plotAreaVirtualWidth;
                double newPlotAreaVirtualWidth = this.Area.AreaModel.LayoutSlot.Width * zoomWidth;
                double newPanOffsetX = (newPlotAreaVirtualWidth * relativeHorizontalPosition) - (e.X - this.Area.AreaModel.LayoutSlot.X);
                newPanOffsetX = this.ClampValue(newPanOffsetX, 0, this.Area.AreaModel.LayoutSlot.Width * (zoomWidth - 1d));

                double virtualVerticalPosition = e.Y - this.Area.AreaModel.LayoutSlot.Y - chartView.PlotOriginY;
                double plotAreaVirtualHeight = this.Area.AreaModel.LayoutSlot.Height * chartView.ZoomHeight;
                double relativeVerticalPosition = virtualVerticalPosition / plotAreaVirtualHeight;
                double newPlotAreaVirtualHeight = this.Area.AreaModel.LayoutSlot.Height * zoomHeight;
                double newPanOffsetY = (newPlotAreaVirtualHeight * relativeVerticalPosition) - (e.Y - this.Area.AreaModel.LayoutSlot.Y);
                newPanOffsetY = this.ClampValue(newPanOffsetY, 0, this.Area.AreaModel.LayoutSlot.Height * (zoomHeight - 1d));

                this.Area.View.Zoom(zoomWidth, zoomHeight);
                this.Area.View.Pan(-newPanOffsetX, -newPanOffsetY);
            }

            return Controller.Empty;
        }

        private double ClampValue(double value, double minValue, double maxValue)
        {
            return Math.Max(minValue, Math.Min(value, maxValue));
        }
    }

To reproduce:
- Add polar series and selection controller


Workaround:

private void RadChartView1_CreateRenderer(object sender, ChartViewCreateRendererEventArgs e)
{
    e.Renderer = new MyPolarRenderer(e.Area as PolarArea);
}

class MyPolarRenderer : PolarRenderer
{
    public MyPolarRenderer(PolarArea area) : base(area)
    { }

    public override DataPoint HitTest(int x, int y)
    {
        for (int i = 0; i < this.DrawParts.Count; i++)
        {
            DataPoint dataPoint = this.DrawParts[i].HitTest(new Point(x, y));
            if (dataPoint != null)
            {
                return dataPoint;
            }
        }

        return base.HitTest(x, y);
    }
    protected override void Initialize()
    {
        base.Initialize();
        for (int i = 0; i < this.DrawParts.Count; i++)
        {
            PolarPointSeriesDrawPart linePart = this.DrawParts[i] as PolarPointSeriesDrawPart;
            if (linePart != null)
            {
                this.DrawParts[i] = new MyDrawpart((PolarPointSeries)linePart.Element, this);
            }
        }
    }

}
class MyDrawpart : PolarPointSeriesDrawPart
{
    public MyDrawpart(PolarPointSeries series, IChartRenderer renderer) : base(series, renderer)
    { }
    public override DataPoint HitTest(Point location)
    {
        if (this.Element.PointSize.Width == 0 || this.Element.PointSize.Height == 0)
        {
            return null;
        }

        for (int i = 0; i < this.Element.DataPoints.Count; i++)
        {
            RadRect slot = this.Element.DataPoints[i].LayoutSlot;
            float pointHalfWidth = this.Element.PointSize.Width / 2;
            float pointHalfHeight = this.Element.PointSize.Height / 2;

            RectangleF dataPointBounds = new RectangleF((float)(slot.X - pointHalfWidth), (float)(slot.Y - pointHalfHeight), this.Element.PointSize.Width, this.Element.PointSize.Height);

            if (dataPointBounds.Contains(location.X, location.Y))
            {
                return this.Element.DataPoints[i];
            }
        }

        return base.HitTest(location);
    }
}

To reproduce:
- Set the palette from the default context menu.
- Try to get the palette name.

Workaround:
class MyChartDataPointElementController : ChartDataPointElementController
{
    protected override RadContextMenu CreatePaletteMenu()
    {
        //return base.CreatePaletteMenu();
        RadContextMenu menu = new RadContextMenu();

        RadChartLocalizationProvider localizationProvider = RadChartLocalizationProvider.CurrentProvider;

        RadMenuItem paletteItem = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.Palette));
        menu.Items.Add(paletteItem);

        RadMenuItem item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteArctic));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteAutumn));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteCold));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteFlower));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteForest));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteGrayscale));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteGround));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteLilac));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteMetro));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteNatural));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PalettePastel));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteRainbow));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);


        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteSpring));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);


        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteSummer));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteWarm));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteWindows8));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        item = new RadMenuItem(localizationProvider.GetLocalizedString(RadChartStringId.PaletteSun));
        item.Click += new System.EventHandler(item_Click);
        paletteItem.Items.Add(item);

        return menu;
    }

    void item_Click(object sender, System.EventArgs e)
    {
        RadMenuItem item = sender as RadMenuItem;
        if (item != null)
        {
            this.Area.View.Palette = ChartPalette.FromKnownPalette(item.Text);
            this.Area.View.Palette.Name = item.Text;
        }
    }
}

Change the controller like this:
 radChartView1.Controllers.Add(new MyChartDataPointElementController());

To reproduce:

private void RadChartView1_LabelFormatting(object sender, ChartViewLabelFormattingEventArgs e)
{
    var dataPoint = e.LabelElement.DataPoint as CategoricalDataPoint;
    if (dataPoint != null)
    {
         e.LabelElement.IsVisible = false;
    }
}

Workaround:
private void RadChartView1_LabelFormatting(object sender, ChartViewLabelFormattingEventArgs e)
{
    var dataPoint = e.LabelElement.DataPoint as CategoricalDataPoint;
    if (dataPoint != null)
    {
        e.LabelElement.Text = "";
    
    }
}

Steps to reproduce:

1. Add a chart to a form.

2. Add and remove series continuously.

3. The memory of the project will only raise and memory will not be freed.

WORKAROUND*:

Clear the data points of the series that is/are removed from the chart.

*Although this will significantly reduce the memory consumption it will not eliminate the memory leak. There will still be a small portion of retained memory.

To reproduce:
- Add at least two series and zoom the chart so the point from one of the series are visible only
- Move the TrackBall
- The Track ball is not shown for some of the points. 

To reproduce: populate RadChartView with data and try to export it to Emf

using (MemoryStream ms = new MemoryStream())
{
    this.radChartView1.ExportToImage(ms, this.radChartView1.Size, System.Drawing.Imaging.ImageFormat.Emf); 
}

Workaround: use some of the other ImageFormats.

How to reproduce:
Dim table As New DataTable()
table.Columns.Add("Name", GetType(String))
table.Columns.Add("X", GetType(Integer))
 
For i As Integer = 0 To 99
    table.Rows.Add($"User {i}", i)
Next
 
Dim series As New BarSeries()
series.DataSource = table
series.CategoryMember = "Name"
series.ValueMember = "X"
 
RadChartView1.Series.Add(series)
 
CType(RadChartView1.Area, CartesianArea).Orientation = Orientation.Horizontal
         
Dim panZoomController As New ChartPanZoomController()
panZoomController.PanZoomMode = ChartPanZoomMode.Vertical
RadChartView1.Controllers.Add(panZoomController)
 
RadChartView1.Zoom(1, 8)

Workaround: create a custom ChartPanZoomController
Dim panZoomController As New MyChartPanZoomController()
panZoomController.PanZoomMode = ChartPanZoomMode.Vertical
RadChartView1.Controllers.Add(panZoomController)

Public Class MyChartPanZoomController
    Inherits ChartPanZoomController

    Protected Overrides Function OnMouseMove(e As MouseEventArgs) As ActionResult

        Dim cartesianArea As CartesianArea = TryCast(Me.Area, CartesianArea)
        If cartesianArea Is Nothing Then
            Return MyBase.OnMouseMove(e)
        End If

        Dim panPoint As Point? = Me.GetType().BaseType.GetField("panPoint", BindingFlags.Instance Or BindingFlags.NonPublic).GetValue(Me)

        If e.Button = MouseButtons.Left AndAlso panPoint.HasValue Then
            Dim offsetX As Double = Me.GetType().BaseType.GetField("offsetX", BindingFlags.Instance Or BindingFlags.NonPublic).GetValue(Me)

            Dim currentOffsetX As Double = offsetX
            Dim defaultAxis As Axis = If(cartesianArea.Orientation = Orientation.Horizontal,
                                         Me.Area.GetType().GetMethod("GetDefaultFirstAxis", BindingFlags.Instance Or BindingFlags.NonPublic).Invoke(Me.Area, New Object() {}),
                                         Me.Area.GetType().GetMethod("GetDefaultSecondAxis", BindingFlags.Instance Or BindingFlags.NonPublic).Invoke(Me.Area, New Object() {}))

            If Me.PanZoomMode = ChartPanZoomMode.Horizontal OrElse Me.PanZoomMode = ChartPanZoomMode.Both Then
                currentOffsetX += (panPoint.Value.X - e.Location.X) * -1

                If currentOffsetX > 0 Then
                    currentOffsetX = 0
                End If

                If currentOffsetX < defaultAxis.Model.LayoutSlot.Width * (DirectCast(cartesianArea.View, IChartView).ZoomWidth - 1) Then
                    currentOffsetX = -defaultAxis.Model.LayoutSlot.Width * (DirectCast(cartesianArea.View, IChartView).ZoomWidth - 1)
                End If
            End If

            Dim offsetY As Double = Me.GetType().BaseType.GetField("offsetY", BindingFlags.Instance Or BindingFlags.NonPublic).GetValue(Me)
            Dim currentOffsetY As Double = offsetY
            If Me.PanZoomMode = ChartPanZoomMode.Vertical OrElse Me.PanZoomMode = ChartPanZoomMode.Both Then
                currentOffsetY += (panPoint.Value.Y - e.Location.Y) * -1

                If currentOffsetY > 0 Then
                    currentOffsetY = 0
                End If

                If currentOffsetY < -defaultAxis.Model.LayoutSlot.Height * (DirectCast(cartesianArea.View, IChartView).ZoomHeight - 1) Then
                    currentOffsetY = -defaultAxis.Model.LayoutSlot.Height * (DirectCast(cartesianArea.View, IChartView).ZoomHeight - 1)
                End If
            End If

            cartesianArea.View.Pan(currentOffsetX, currentOffsetY)
        End If

        Return Controller.Empty

    End Function

End Class

Use the attached project to reproduce.

Workaround:
Hide the panel after the form is shown.

The event should not be triggered when moving the mouse over the same data point, as we already asked for data for it. We can cache it and reuse it.

Steps to reproduce:

1. On a button click create a chart, add series and a data source.

2. Call the Dispose method of the chart.

You will notice that the memory allocated by the chart will not be released

Workaround: clear the series before you dispose of the chart.

Steps to reproduce: 
1. Add RadChartView with two BarSeries 
2. Set the Name property of series 
3. Set the SelectionMode property to SingleDataPoint
4. Subscribe to the SelectedPointChanging/SelectedPointChanged events. 
5. Run the form and select points from different series. The OldSelectedSeries/NewSelectedSeries properties always return the name of the first series now matter which series is selected. 

Workaround: 
void radChartView1_SelectedPointChanged(object sender, ChartViewSelectedPointChangedEventArgs e)
{
    BarSeries series = (e.NewSelectedPoint).Presenter as BarSeries;

    if (series.Name == "Q1")
    {
        Console.WriteLine(series.Name);
    }
    else if (series.Name == "Q2")
    {
        Console.WriteLine(series.Name);
    }
}

To reproduce:

LineSeries lineSeries = new LineSeries();
lineSeries.DataPoints.Add(new CategoricalDataPoint(20, "Jan"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(22, "Apr"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(12, "Jul"));
lineSeries.DataPoints.Add(new CategoricalDataPoint(19, "Oct"));
lineSeries.LegendTitle = "Series A asdafsafasfd fgsdfg sdfs dfg dafsvsd";
this.radChartView1.Series.Add(lineSeries);
LineSeries lineSeries2 = new LineSeries();
lineSeries2.DataPoints.Add(new CategoricalDataPoint(18, "Jan"));
lineSeries2.DataPoints.Add(new CategoricalDataPoint(15, "Apr"));
lineSeries2.DataPoints.Add(new CategoricalDataPoint(17, "Jul"));
lineSeries2.DataPoints.Add(new CategoricalDataPoint(22, "Oct"));
lineSeries2.LegendTitle = "Series B sdf asdf adfasdfas dfadsf asdf sadf awef";
this.radChartView1.Series.Add(lineSeries2);
LineSeries lineSeries3 = new LineSeries();
lineSeries3.DataPoints.Add(new CategoricalDataPoint(13, "Jan"));
lineSeries3.DataPoints.Add(new CategoricalDataPoint(14, "Apr"));
lineSeries3.DataPoints.Add(new CategoricalDataPoint(12, "Jul"));
lineSeries3.DataPoints.Add(new CategoricalDataPoint(25, "Oct"));
lineSeries3.LegendTitle = "Series C sdf asdf adfasdfas dfadsf asdf sadf awef";
this.radChartView1.Series.Add(lineSeries3);

this.radChartView1.ShowLegend = true;
this.radChartView1.ChartElement.LegendPosition = Telerik.WinControls.UI.LegendPosition.Bottom;
radChartView1.ChartElement.LegendElement.StackElement.Orientation = Orientation.Horizontal;

Workaround: specify minimum height for the legend

radChartView1.ChartElement.LegendElement.MinSize = new Size(0, 50);

To reproduce: 
- Add two donut series and set their RadiusFactor so both series can be seen.
- Add ChartSelectionController.
- You will be able to select points from the firs series only. 

Workaround:
class MyPieRenderer : PieRenderer
{
    public MyPieRenderer(PieArea area) : base(area)
    {
    }

    public override DataPoint HitTest(int x, int y)
    {
        if (this.DrawParts.Count > 0)
        {
            foreach (var item in this.DrawParts)
            {
                if (item is PieSeriesDrawPart)
                {
                    Dictionary<PieDataPoint, GraphicsPath> paths = ((PieSeriesDrawPart)item).PointPaths;

                    foreach (PieDataPoint point in paths.Keys)
                    {
                        GraphicsPath path = new GraphicsPath();
                        paths.TryGetValue(point, out path);

                        if (path != null)
                        {
                            if (path.IsVisible(x, y))
                            {
                                return point;
                            }
                        }
                    }
                }
            }
        }
        return null;
    }
}
private void RadChartView1_CreateRenderer(object sender, ChartViewCreateRendererEventArgs e)
{
    e.Renderer = new MyPieRenderer((PieArea)e.Area);
}

To reproduce:
- Add DateTimeContinuousAxis to a chart and set its MajorStep property.

Workaround:
Create the DateTimeContinuousAxis in the code behind.

To reproduce:

Public Sub New()
    InitializeComponent()

    Me.RadChartView1.ShowTitle = True
    Me.RadChartView1.ChartElement.TitleElement.TextWrap = True
    Me.RadChartView1.Title = "This is a very long chart title that can't fit in a single line"

    Dim barSeries As New BarSeries("Performance", "RepresentativeName")
    barSeries.Name = "Q1"
    barSeries.DataPoints.Add(New CategoricalDataPoint(177, "Harley"))
    barSeries.DataPoints.Add(New CategoricalDataPoint(128, "White"))
    barSeries.DataPoints.Add(New CategoricalDataPoint(143, "Smith"))
    barSeries.DataPoints.Add(New CategoricalDataPoint(111, "Jones"))
    barSeries.DataPoints.Add(New CategoricalDataPoint(118, "Marshall"))
    Me.RadChartView1.Series.Add(barSeries)
End Sub

Private Sub radButton1_Click(sender As Object, e As EventArgs) Handles RadButton1.Click 
    Dim filePath As String = "..\..\..\exprtedChart.png"
    Me.RadChartView1.ExportToImage(filePath, Me.RadChartView1.Size, System.Drawing.Imaging.ImageFormat.Png)
    Process.Start(filePath)
End Sub


Workaround: titleSize must consider the chart's width

Public Sub New()
    InitializeComponent()
    AddHandler Me.RadChartView1.CreateRenderer, AddressOf CreateRenderer
    Me.RadChartView1.ShowTitle = True
    Me.RadChartView1.ChartElement.TitleElement.TextWrap = True
    Me.RadChartView1.Title = "This is a very long chart title that can't fit in a single line"

    Dim barSeries As New BarSeries("Performance", "RepresentativeName")
    barSeries.Name = "Q1"
    barSeries.DataPoints.Add(New CategoricalDataPoint(177, "Harley"))
    barSeries.DataPoints.Add(New CategoricalDataPoint(128, "White"))
    barSeries.DataPoints.Add(New CategoricalDataPoint(143, "Smith"))
    barSeries.DataPoints.Add(New CategoricalDataPoint(111, "Jones"))
    barSeries.DataPoints.Add(New CategoricalDataPoint(118, "Marshall"))
    Me.RadChartView1.Series.Add(barSeries)
End Sub

Private Sub radButton1_Click(sender As Object, e As EventArgs) Handles RadButton1.Click
    Dim filePath As String = "..\..\..\exprtedChart.png"
    Using fs As New FileStream(filePath, FileMode.Create, FileAccess.Write)
        ExportToImage(Me.RadChartView1, fs, Me.RadChartView1.Size, System.Drawing.Imaging.ImageFormat.Png)
    End Using
    Process.Start(filePath)
End Sub

Public Sub ExportToImage(chart As RadChartView, stream As Stream, size As Size, imageFormat As ImageFormat)
    If Not chart.IsLoaded Then
        chart.LoadElementTree()
    End If

    Dim bmp As New Bitmap(size.Width, size.Height)
    Dim graphics__1 As Graphics = Graphics.FromImage(bmp)
    graphics__1.Clear(Color.White)

    Dim titleSize As SizeF = graphics__1.MeasureString(chart.Title, chart.ChartElement.TitleElement.Font, chart.Width)

    If chart.ChartElement.TitleElement.TextOrientation = Orientation.Vertical Then
        Dim swap As Single = titleSize.Height
        titleSize.Height = titleSize.Width
        titleSize.Width = swap
    End If

    Dim titleRect As New RadRect(0, 0, titleSize.Width, titleSize.Height)
    Dim legendRect As New RadRect(0, 0, size.Width, size.Height)
    Dim chartRect As RadRect = legendRect

    Select Case chart.ChartElement.TitlePosition
        Case TitlePosition.Top, TitlePosition.Bottom
            titleRect.Width = size.Width
            Exit Select
        Case TitlePosition.Right, TitlePosition.Left
            titleRect.Height = size.Height
            Exit Select
    End Select

    chartRect.X += chart.View.Margin.Left
    chartRect.Y += chart.View.Margin.Top
    chartRect.Width -= chart.View.Margin.Horizontal
    chartRect.Height -= chart.View.Margin.Vertical

    If chart.ShowTitle Then
        Select Case chart.ChartElement.TitlePosition
            Case TitlePosition.Top
                legendRect.Y += titleRect.Height
                chartRect.Y += titleRect.Height
                legendRect.Height -= titleRect.Height
                chartRect.Height -= titleRect.Height
                Exit Select
            Case TitlePosition.Right
                titleRect.X = size.Width - chart.ChartElement.TitleElement.Size.Width
                titleRect.Height = size.Height
                legendRect.Width -= titleRect.Width
                chartRect.Width -= titleRect.Width
                Exit Select
            Case TitlePosition.Bottom
                titleRect.Y = size.Height - chart.ChartElement.TitleElement.Size.Height
                titleRect.Width = size.Width
                legendRect.Height -= titleRect.Height
                chartRect.Height -= titleRect.Height
                Exit Select
            Case TitlePosition.Left
                titleRect.Height = size.Height
                legendRect.X += titleRect.Width
                chartRect.X += titleRect.Width
                legendRect.Width -= titleRect.Width
                chartRect.Width -= titleRect.Width
                Exit Select
        End Select
    End If

    If chart.ShowLegend Then
        Select Case chart.ChartElement.LegendPosition
            Case LegendPosition.Right
                If chart.ChartElement.TitlePosition = TitlePosition.Right Then
                    legendRect.X = titleRect.X - chart.ChartElement.LegendElement.Size.Width
                Else
                    legendRect.X = size.Width - chart.ChartElement.LegendElement.Size.Width
                End If

                legendRect.Width = chart.ChartElement.LegendElement.Size.Width
                chartRect.Width -= legendRect.Width + chart.View.Margin.Right
                Exit Select
            Case LegendPosition.Bottom
                If chart.ChartElement.TitlePosition = TitlePosition.Bottom Then
                    legendRect.Y = titleRect.Y - chart.ChartElement.LegendElement.Size.Height
                Else
                    legendRect.Y = size.Height - chart.ChartElement.LegendElement.Size.Height
                End If

                legendRect.Height = chart.ChartElement.LegendElement.Size.Height
                chartRect.Height -= legendRect.Height
                Exit Select
            Case LegendPosition.Left
                legendRect.Width = chart.ChartElement.LegendElement.Size.Width
                chartRect.X += legendRect.Width + chart.View.Margin.Left
                chartRect.Width -= legendRect.Width + chart.View.Margin.Left
                Exit Select
            Case LegendPosition.Top
                legendRect.Height = chart.ChartElement.LegendElement.Size.Height
                chartRect.Y += legendRect.Height
                chartRect.Height -= legendRect.Height
                Exit Select
            Case LegendPosition.Float
                legendRect.Width = chart.ChartElement.LegendElement.Size.Width
                legendRect.Height = chart.ChartElement.LegendElement.Size.Height
                Dim xRatio As Double = size.Width / Me.Size.Width
                Dim yRatio As Double = size.Height / Me.Size.Height
                legendRect.X = (chart.ChartElement.LegendOffset.X * xRatio) + (If((chart.ChartElement.TitlePosition = TitlePosition.Left), titleRect.Right, 0.0))
                legendRect.Y = (chart.ChartElement.LegendOffset.Y * yRatio) + (If((chart.ChartElement.TitlePosition = TitlePosition.Top), titleRect.Bottom, 0.0F))
                Exit Select
        End Select
    End If

    If chart.ShowLegend Then
        Dim xTransform As Single = CSng(legendRect.X) - chart.ChartElement.LegendElement.ControlBoundingRectangle.X + _
        (CSng(legendRect.Width) - chart.ChartElement.LegendElement.ControlBoundingRectangle.Width) / 2.0F
        Dim yTransform As Single = CSng(legendRect.Y) - chart.ChartElement.LegendElement.ControlBoundingRectangle.Y + _
        (CSng(legendRect.Height) - chart.ChartElement.LegendElement.ControlBoundingRectangle.Height) / 2.0F
        graphics__1.TranslateTransform(xTransform, yTransform)
        chart.ChartElement.LegendElement.Paint(New RadGdiGraphics(graphics__1), _
                                               chart.ChartElement.LegendElement.ControlBoundingRectangle, 0.0F, New SizeF(1.0F, 1.0F), True)
        graphics__1.ResetTransform()
    End If

    Dim radGraphics As New RadGdiGraphics(graphics__1)

    If chart.ShowTitle Then
        radGraphics.DrawString(chart.Title, GetTitleDrawRectangle(ChartRenderer.ToRectangleF(titleRect), _
                                                                  titleSize, chart.ChartElement.TitleElement.TextAlignment), chart.ChartElement.TitleElement.Font, _
                               chart.ChartElement.TitleElement.ForeColor, chart.ChartElement.TitleElement.TextParams.CreateStringFormat(), _
                               chart.ChartElement.TitleElement.TextOrientation, _
                               chart.ChartElement.TitleElement.FlipText)
    End If

    chart.View.Layout(chartRect)
    renderer.Draw(graphics__1)

    bmp.Save(stream, imageFormat)
    chart.View.Layout()
End Sub

Private Function GetTitleDrawRectangle(drawArea As RectangleF, textRect As SizeF, textAlignment As ContentAlignment) As RectangleF
    Select Case textAlignment
        Case ContentAlignment.BottomCenter
            Return New RectangleF(New PointF(drawArea.X + (drawArea.Width - textRect.Width) / 2.0F, drawArea.Bottom - textRect.Height), textRect)
        Case ContentAlignment.BottomLeft
            Return New RectangleF(New PointF(drawArea.X, drawArea.Bottom - textRect.Height), textRect)
        Case ContentAlignment.BottomRight
            Return New RectangleF(New PointF(drawArea.Right - textRect.Width, drawArea.Bottom - textRect.Height), textRect)
        Case ContentAlignment.MiddleCenter
            Return New RectangleF(New PointF(drawArea.X + (drawArea.Width - textRect.Width) / 2.0F, drawArea.Y + (drawArea.Height - textRect.Height) / 2.0F), textRect)
        Case ContentAlignment.MiddleLeft
            Return New RectangleF(New PointF(drawArea.X, drawArea.Y + (drawArea.Height - textRect.Height) / 2.0F), textRect)
        Case ContentAlignment.MiddleRight
            Return New RectangleF(New PointF(drawArea.Right - textRect.Width, drawArea.Y + (drawArea.Height - textRect.Height) / 2.0F), textRect)
        Case ContentAlignment.TopCenter
            Return New RectangleF(New PointF(drawArea.X + (drawArea.Width - textRect.Width) / 2, drawArea.Y), textRect)
        Case ContentAlignment.TopLeft
            Return New RectangleF(drawArea.Location, textRect)
        Case ContentAlignment.TopRight
            Return New RectangleF(New PointF(drawArea.Right - textRect.Width, drawArea.Y), textRect)
        Case Else
            Return New RectangleF(drawArea.Location, textRect)
    End Select
End Function

Dim renderer As CartesianRenderer
Private Sub CreateRenderer(sender As Object, e As ChartViewCreateRendererEventArgs)
    e.Renderer = New CartesianRenderer(DirectCast(e.Area, CartesianArea))
    renderer = e.Renderer
End Sub

To reproduce:
- Enable the Trackball
- Use the following code:
public RadForm1()
{
    InitializeComponent();

    ScatterLineSeries sls = radChartView1.Series[0] as ScatterLineSeries;
    sls.XValueMember = "X";
    sls.YValueMember = "Y";
}

private void timer1_Tick(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    dt.Columns.Add("X", typeof(double));
    dt.Columns.Add("Y", typeof(double));

    Random ran = new Random();
    for (int i = 0; i < 100; i++)
        dt.Rows.Add(i, 1 + ran.NextDouble() / 10);

    radChartView1.Series[0].DataSource = dt;
}

Workaround:
class MyChartTrackballController : ChartTrackballController
{
    protected override string GetPointText(DataPoint point)
    {
        ChartSeries series = point.Presenter as ChartSeries;
        if (series == null)
        {
            return string.Empty;
        }
        return base.GetPointText(point);
    }
}