Until the feature becomes available use the following workaround:

MyPivotGridChartDataProvider chartProvider = new MyPivotGridChartDataProvider(this.radPivotGrid1.PivotGridElement);
this.radPivotGrid1.ChartDataProvider = chartProvider;
this.radChartView1.DataSource = this.radPivotGrid1;
this.radChartView1.ShowLegend = true;
this.radPivotGrid1.ChartDataProvider.SeriesAxis = Telerik.Pivot.Core.PivotAxis.Rows;
this.radPivotGrid1.ChartDataProvider.GeneratedSeriesType = Telerik.WinControls.UI.GeneratedSeriesType.Line;

public class MyPivotGridChartDataProvider : PivotGridChartDataProvider
{
    public MyPivotGridChartDataProvider(RadPivotGridElement pivotGridElement)
        : base(pivotGridElement) { }

    public override void UpdateChartData()
    {
        base.UpdateChartData();

        foreach (ChartSeries series in this.ChartView.Series)
        {
            CartesianSeries cartesianSeries = series as CartesianSeries;
            if (cartesianSeries == null)
            {
                continue;
            }

            cartesianSeries.PointSize = new SizeF(7, 7);

            BindingList<PivotChartModelPoint> newData = new BindingList<PivotChartModelPoint>();
            BindingList<PivotDataPoint> points = cartesianSeries.DataSource as BindingList<PivotDataPoint>;

            foreach (PivotDataPoint point in points)
            {
                PivotChartModelPoint current = new PivotChartModelPoint() { Group = point.PivotGroup };
                if (point.Value != 0)
                {
                    current.Value = point.Value;
                }
                else
                {
                    current.Value = null;
                }

                newData.Add(current);
            }

            cartesianSeries.DataSource = null;

            cartesianSeries.CategoryMember = "Group";
            cartesianSeries.ValueMember = "Value";
            cartesianSeries.DataSource = newData;
        }
    }
}

public class PivotChartModelPoint
{
    public string Group{ get; set; }

    public double? Value { get; set; }
}

Hour, minute, second, if possible also week

Workaround: remove the localization provider before saving the layout and then add it back.

IMPROVE. RadPivotGrid - expose a method for accessing cell values

Steps to reproduce:
1. Add a RadPivotGrid to a form and populate it with data or use the one in the Demo application
2. Press Ctrl+A to select all cells
3, Press Ctrl+C to copy all cells to the clipboard

You will get an exception.

To reproduce:

Add a RadPivotGrid and a few columns, select one column and show the PrintingDialog. Select "Print Selection Only", exception will occur.

Workaround:
Use the following print style -

public class MyPrintStyle : PivotGridPrintStyle
{
    private Func<Rectangle, SizeF> getScaleFactors;
    private Func<int, Rectangle, float, int> getStartColumn;
    private Func<int, Rectangle, float, int> getEndColumn;
    private Func<int, Rectangle, float, int> getStartRow;
    private Func<int, Rectangle, float, int> getEndRow;

    private List<AggregateDescriptionBase> aggregates;
    private List<int> columnWidths;
    private List<int> rowHeights;

    private Type baseType;
    private BindingFlags flags;

    public override void Initialize()
    {
        base.Initialize();

        this.baseType = typeof(PivotGridPrintStyle);
        this.flags = BindingFlags.NonPublic | BindingFlags.Instance;

        this.getScaleFactors = this.GetFuncFromParent<Rectangle, SizeF>("GetScaleFactors");
        this.getStartColumn = this.GetFuncFromParent<int, Rectangle, float, int>("GetStartColumn");
        this.getEndColumn = this.GetFuncFromParent<int, Rectangle, float, int>("GetEndColumn");
        this.getStartRow = this.GetFuncFromParent<int, Rectangle, float, int>("GetStartRow");
        this.getEndRow = this.GetFuncFromParent<int, Rectangle, float, int>("GetEndRow");

        this.aggregates = GetField<List<AggregateDescriptionBase>>("aggregates");
        this.columnWidths = GetField<List<int>>("columnWidths");
        this.rowHeights = GetField<List<int>>("rowHeights");

    }

    private T GetField<T>(string name)
    {
        return (T)this.baseType.GetField(name, flags).GetValue(this);
    }

    private Func<T, TResult> GetFuncFromParent<T, TResult>(string method)
    {
        MethodInfo getScaleFactor = baseType.GetMethod(method, flags);
        var func = (Func<T, TResult>)Delegate.CreateDelegate(typeof(Func<T, TResult>), this, getScaleFactor);
        return func;
    }

    private Func<T1, T2, T3, TResult> GetFuncFromParent<T1, T2, T3, TResult>(string method)
    {
        MethodInfo getScaleFactor = baseType.GetMethod(method, flags);
        var func = (Func<T1, T2, T3, TResult>)Delegate.CreateDelegate(typeof(Func<T1, T2, T3, TResult>), this, getScaleFactor);
        return func;
    }

    public override void DrawPage(Rectangle drawArea, Graphics graphics, int pageNumber)
    {
        int x = drawArea.X;
        int y = drawArea.Y;
        SizeF scale = this.getScaleFactors(drawArea);
        
        int startColumn = this.getStartColumn(pageNumber, drawArea, scale.Width);
        int endColumn = this.getEndColumn(startColumn, drawArea, scale.Width);
        int startRow = this.getStartRow(pageNumber, drawArea, scale.Height);
        int endRow = this.getEndRow(startRow, drawArea, scale.Height);
        int aggregateIndex = 0;
        for (int i = startRow; i <= endRow; i++)
        {
            x = drawArea.X;
            int maxHeight = 0;
        
            for (int j = startColumn; j <= endColumn; j++)
            {
                if (j == 0 && i == 0 && aggregateIndex < this.aggregates.Count)
                {
                    while (aggregateIndex < this.aggregates.Count)
                    {
                        if (j >= this.columnWidths.Count || i >= this.rowHeights.Count)
                        {
                            break;
                        }
        
                        Rectangle aggregateElementRect = new Rectangle(x, y, this.columnWidths[j], this.rowHeights[i]);
                        RadPrintElement aggregatePrintElement = this.GetAggregateDescriptorCell(aggregateIndex++);
                        aggregatePrintElement.ScaleTransform = scale;
                        RectangleF aggregateTransformedRect = aggregatePrintElement.GetTransformedBounds(aggregateElementRect);
                        this.PrintElement(aggregatePrintElement, drawArea, aggregateElementRect, graphics);
                        x += (int)Math.Floor(aggregateTransformedRect.Width);
                        maxHeight = Math.Max(maxHeight, (int)Math.Floor(aggregateTransformedRect.Height));
                        if (aggregateIndex < this.aggregates.Count)
                        {
                            j++;
                        }
                    }
        
                    continue;
                }
        
                Rectangle elementRect = new Rectangle(x, y, this.columnWidths[j], this.rowHeights[i]);
                RadPrintElement printElement = this.GetPrintElementForCell(i, j);
                printElement.ScaleTransform = scale;
                RectangleF transformedRect = printElement.GetTransformedBounds(elementRect);
        
                this.PrintElement(printElement, drawArea, elementRect, graphics);
                x += (int)Math.Floor(transformedRect.Width);
                maxHeight = Math.Max(maxHeight, (int)Math.Floor(transformedRect.Height));
            }
        
            y += maxHeight;
        }
    }
}

If you have an object with string property and for all the available objects in the RadPivotgrid you have numeric values for this property with leading zero digits (e.g. "002"), it is exported in Excel as a numeric cell.

To reproduce:
- Open the demo application and navigate to the olap browser demo.
- Click the filter icon in the Product Line (top left corner).

To reproduce:

private void Form1_Load(object sender, EventArgs e)
{
    this.ordersTableAdapter.Fill(this.nwindDataSet.Orders);
    
    LocalDataSourceProvider dataProvider = new LocalDataSourceProvider(); 
    dataProvider.Culture = new System.Globalization.CultureInfo("ru-RU"); 
    dataProvider.ItemsSource = this.ordersBindingSource;

    dataProvider.BeginInit();
    dataProvider.RowGroupDescriptions.Add(new DateTimeGroupDescription() { PropertyName = "OrderDate", Step = DateTimeStep.Year, GroupComparer = new GroupNameComparer() });
    dataProvider.RowGroupDescriptions.Add(new DateTimeGroupDescription() { PropertyName = "OrderDate", Step = DateTimeStep.Quarter, GroupComparer = new GroupNameComparer() });
    dataProvider.RowGroupDescriptions.Add(new DateTimeGroupDescription() { PropertyName = "OrderDate", Step = DateTimeStep.Month, GroupComparer = new GroupNameComparer() });
    dataProvider.ColumnGroupDescriptions.Add(new PropertyGroupDescription() { PropertyName = "EmployeeID", GroupComparer = new GrandTotalComparer() });
    dataProvider.EndInit();

    dataProvider.BeginInit();
    dataProvider.AggregateDescriptions.Add(new PropertyAggregateDescription() { PropertyName = "Freight", AggregateFunction = AggregateFunctions.Sum });
    dataProvider.AggregateDescriptions.Add(new PropertyAggregateDescription() { PropertyName = "Freight", AggregateFunction = AggregateFunctions.Average });
    dataProvider.EndInit();

    this.radPivotGrid1.DataProvider = dataProvider;
}


Workaround:

CultureInfo russianCultureInfo = new System.Globalization.CultureInfo("ru-RU"); 
List<string> monthNames = DateTimeFormatInfo.CurrentInfo.MonthNames.ToList();

public Form1()
{
    InitializeComponent();
    this.radPivotGrid1.GroupDescriptorElementCreating += radPivotGrid1_GroupDescriptorElementCreating;
}

private void radPivotGrid1_GroupDescriptorElementCreating(object sender, GroupDescriptorElementCreatingEventArgs e)
{
    if (e.GroupDescriptorElement.Text == "Month")
    {
        e.GroupDescriptorElement.FilterPopup.PopupOpening -= FilterPopupPopupOpening;
        e.GroupDescriptorElement.FilterPopup.PopupOpening += FilterPopupPopupOpening;
    }
}

private void FilterPopupPopupOpening(object sender, CancelEventArgs args)
{
    PivotGroupFilterPopup popup = sender as PivotGroupFilterPopup;
    if (popup != null)
    {
        popup.TreeViewMenuItem.TreeElement.TreeView.NodeFormatting -= TreeView_NodeFormatting;
        popup.TreeViewMenuItem.TreeElement.TreeView.NodeFormatting += TreeView_NodeFormatting;
    }
}

private void TreeView_NodeFormatting(object sender, TreeNodeFormattingEventArgs e)
{
    DateTime date;
    int monthIndex = monthNames.IndexOf(e.Node.Text);
  
    if (monthIndex > -1)
    {
        e.Node.Text = russianCultureInfo.DateTimeFormat.MonthNames[monthIndex];
    }
}

To reproduce: 

Create a localization provider following the article - http://wwwsit.telerik.com/help/winforms/pivotgrid-localization-localization.html. When you start the app you will see that the PivotAggregateP0ofP1 is not used.

Workaround:

Use the formatting events to format the needed values - http://wwwsit.telerik.com/help/winforms/pivotgrid-formatting-appearance.html

Argument exception when a specific layout is loaded:
"An item with the same key has already been added."

To reproduce:

1. Add a RadPivotGrid and  change its theme to TelerikMetro. This theme uses Segoe UI font for its cells.
2. Export the RadPivotGrid.
3. You will notice that the font is applied to some of the cells, but for others, e.g. Grand Total the default font is set to Microsoft Sans Serif

Second scenario: use Demo application PivotGrid >> Export to Excel example. Use ControlDefault theme.
1. Ctrl + H to show the spy.  Check font for row  "Jun-1 >> Sum of Net", column "Printer stand >> 1 Free with 10".  The font is Segoe UI.
2. Run the export and check the same cell in Excel. Its font is Microsoft Sans Serif.

Workaround: use the PivotExcelCellFormatting event to specify the font.

To reproduce:
- Add calculated field
- Try to set its number format, by clicking the Number Format option in the context menu in the field list (see image)

Workaround:
 Private Sub RadPivotGrid1_CellFormatting(sender As Object, e As UI.PivotCellEventArgs) Handles RadPivotGrid1.CellFormatting
        If e.CellElement.Column.Name = "Commission" Then
            e.CellElement.Text = String.Format(System.Threading.Thread.CurrentThread.CurrentUICulture, "{0:C}", e.CellElement.Value)
        End If
    End Sub

Workaround: 
PivotExportToExcelML.ExportVisualSettings = false;

Workaround: 

private void radPivotGrid1_GroupDescriptorElementCreating(object sender, Telerik.WinControls.UI.GroupDescriptorElementCreatingEventArgs e)
{
    e.GroupDescriptorElement.FilterPopup.PopupOpened -= FilterPopup_PopupOpened;
    e.GroupDescriptorElement.FilterPopup.PopupOpened += FilterPopup_PopupOpened;
}

private void FilterPopup_PopupOpened(object sender, EventArgs args)
{
    PivotGroupFilterPopup filterPopup = (PivotGroupFilterPopup)sender;
    RadTreeView tree = filterPopup.TreeViewMenuItem.TreeElement.TreeView;
    int height = this.CalculateHeight(tree);
    if (height > tree.Height)
    {
        ((RadScrollBarElement)tree.TreeViewElement.Children[2]).Value = 0;
        ((RadScrollBarElement)tree.TreeViewElement.Children[2]).Maximum = height;
        ((RadScrollBarElement)tree.TreeViewElement.Children[2]).Visibility = Telerik.WinControls.ElementVisibility.Visible;
    }
}

private int CalculateHeight(RadTreeView tree)
{
    int height = 0;
    for (int i = 0; i < tree.Nodes[0].Nodes.Count + 1; i++)
    {
        height += tree.ItemHeight;
    }

    return height;
}

Workaround:
public Form1()
{
    InitializeComponent();
    this.radPivotGrid1.GroupDescriptorElementCreating += radPivotGrid1_GroupDescriptorElementCreating;
}

private void radPivotGrid1_GroupDescriptorElementCreating(object sender, Telerik.WinControls.UI.GroupDescriptorElementCreatingEventArgs e)
{
    e.GroupDescriptorElement.FilterPopup.PopupOpened -= FilterPopup_PopupOpened;
    e.GroupDescriptorElement.FilterPopup.PopupOpened += FilterPopup_PopupOpened;
}

private void FilterPopup_PopupOpened(object sender, EventArgs args)
{
    PivotGroupFilterPopup filterPopup = (PivotGroupFilterPopup)sender;
    RadTreeView tree = filterPopup.TreeViewMenuItem.TreeElement.TreeView;

    ((RadScrollBarElement)tree.TreeViewElement.Children[2]).Value = 10;
    ((RadScrollBarElement)tree.TreeViewElement.Children[2]).Value = 0;
}

To reproduce:
Resize some of the columns in PivotGrid and then export it with PivotExporttoExcelML. All columns in exported file have the same width.
Workaround:
Use PivotGridSpreadExport.