To reproduce:
- Add two tool windows and auto hide them, one on the left and on the right
- Then call the AutoHideWindow method like this (ToolWindow1 should be on left side):

RadDock1.AutoHideWindow(ToolWindow1)

- You will notice that the second windows is moved on the left.

Workaround:
Use the DockState property instead of the method.

If you drag a regular form to the top of the screen it will be maximized. This should work with the floating window as well.

To reproduce: 
See attached video.

Workaround:
public Form1()
{
    RadDockEvents.TabStripItemCreating += RadDockEvents_TabStripItemCreating;
    InitializeComponent();
    radDock1.AutoHideAnimation = Telerik.WinControls.UI.Docking.AutoHideAnimateMode.None;

}
void RadDockEvents_TabStripItemCreating(object sender, TabStripItemCreatingEventArgs args)
{
    if (args.AutoHide)
    {
        var currentScale = args.TabItem.DpiScaleFactor;

        Screen showScreen = Screen.FromControl(this);
        SizeF scale = NativeMethods.GetMonitorDpi(showScreen, NativeMethods.DpiType.Effective);
        if (scale != currentScale)
        {
            var font = args.TabItem.Font;
            var newFont = new Font(font.Name, font.Size * scale.Width, font.Style);
            args.TabItem.Font = newFont;
        }
    }
}
protected override void OnClosed(EventArgs e)
{
    RadDockEvents.TabStripItemCreating -= RadDockEvents_TabStripItemCreating;
    base.OnClosed(e);
}

Please run the sample project in an environment with left monitor at 150% DPI scaling and right monitor at 100%. You will notice that the ToolWindow remains with fixed width.

To reproduce:
radDock1.ElementTree.EnableApplicationThemeName = false;
radDock1.ThemeName = "TelerikMetroBlue";
ThemeResolutionService.ApplicationThemeName = "Office2013Light";

Workaround:
ThemeResolutionService.ApplyThemeToControlTree(this,"Office2013Light");
radDock1.ThemeName = "TelerikMetroBlue";

To reproduce:
- Add a form with two auto-hidden windows - one on the left and one on the right.
- Drag one of the windows by just showing it (do not pin it)
- The floating window will contain both tool windows, instead of just the dragged one.

Workaround:
Private Sub RadForm1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    RadDock1.DockWindow(ToolWindow2, DockPosition.Right)
    RadDock1.AutoHideWindows(New DockWindow() {ToolWindow2}, AutoHidePosition.Right)
    ToolWindow2.Tag = DockPosition.Right
 
    RadDock1.AutoHideWindow(ToolWindow1)
    ToolWindow1.Tag = DockPosition.Left
End Sub
 
Private Sub RadDock1_FloatingWindowCreated(sender As Object, e As FloatingWindowEventArgs) Handles RadDock1.FloatingWindowCreated
    For Each dw As DockWindow In CType(sender, RadDock).DockWindows
        If dw.Handle <> CType(sender, RadDock).ActiveWindow.Handle Then
            dw.DockState = dw.PreviousDockState
 
            RadDock1.AutoHideWindows(New DockWindow() {dw}, dw.Tag)
        End If
    Next
End Sub

How to reproduce:
1. Run the attached project
2. Float a tool window
3. Save layout
4. Close the application and start it again
5. Load the saved layout
6. Hide the floating tool window
7. Save layout
8. Close the application and start it again
9. Load layout
Notice that the hidden tool window would be floating

Workaround:
Manually store the hidden tool windows and restore their state after your load the layout:
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void radButton1_Click(object sender, EventArgs e)
    {
        this.radDock1.SaveToXml(@"..\..\layout.xml");
        StringBuilder sb = new StringBuilder();
        foreach (DockWindow window in this.radDock1.DockWindows.GetWindows(DockState.Hidden))
        {
            if (window is ToolWindow)
            {
                sb.Append(window.Name);
                sb.Append(";");
            }
        }

        File.WriteAllText(@"..\..\hidden.txt", sb.ToString());
    }

    private void radButton2_Click(object sender, EventArgs e)
    {
        this.radDock1.LoadFromXml(@"..\..\layout.xml");

        string[] windows = File.ReadAllText(@"..\..\hidden.txt").Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries);
        foreach (var window in windows)
        {
            this.radDock1.GetWindow<ToolWindow>(window).Hide();
        }
    }
}

How to reproduce: check the attached project and video.

Workaround: persist the auto-hidden windows separately
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        this.radDock1.AutoHideWindowDisplaying += RadDock1_AutoHideWindowDisplaying;

        //Wworkaround
        this.radDock1.LoadedFromXml += RadDock1_LoadedFromXml;
    }

    private void RadDock1_LoadedFromXml(object sender, EventArgs e)
    {
        string res = File.ReadAllText(@"..\..\auto-hidden.txt");
        foreach (DockWindow window in this.radDock1.GetWindows(typeof(ToolWindow), typeof(HostWindow)))
        {
            if (res.IndexOf(window.Name) != -1)
            {
                window.DockState = DockState.AutoHide;
            }
        }
    }

    private void RadDock1_AutoHideWindowDisplaying(object sender, Telerik.WinControls.UI.Docking.AutoHideWindowDisplayingEventArgs e)
    {
    }

    private void button1_Click(object sender, EventArgs e)
    {
        StringBuilder sb = new StringBuilder();
        foreach (DockWindow window in this.radDock1.GetWindows(typeof(ToolWindow), typeof(HostWindow)))
        {
            if (window.DockState == DockState.AutoHide)
            {
                sb.AppendLine(window.Name);
            }
        }

        File.WriteAllText(@"..\..\auto-hidden.txt", sb.ToString());
        this.radDock1.SaveToXml(@"..\..\layout.xml");
    }

    private void button2_Click(object sender, EventArgs e)
    {
        this.radDock1.LoadFromXml(@"..\..\layout.xml");
    }
}

Please use attached project and try the following:

1. Run the application and move toolWindow3 from right to the bottom panel.
2. Hide toolWindow3 by 'Toggle' menu item or just close it.
3. Save the layout pressing 'Save' menu item.
4. Close the application and run it again.
5. Restore layout using 'Init' menu item.
6. Press 'Toggle' menu item to show toolWindow3. 

Workaround:
Make the window visible before loading the layout.

To reproduce: please run the attached sample project  and follow the steps in the gif file.  After some further testing you will notice that the tab items are re-positioned incorrectly when you click a certain tab. It jumps to another location.

Workaround: set the MultiLineItemFitMode property to None and specify the DocumentWindow.TabStripItem.Row property in order to arrange the tabs as you wish.

The problematic tool window has a user control that is docked to fill and it is built entirely with Telerik controls. The dock control, tab strips, windows and even the controls inside the user control are correctly scaled. The issue comes when you start undocking and then docking the tool window. The size of the user control increases with each operation. The controls have anchors and although they have correct scaling they get stretched. This results in messed layout. 

The DocumentTabStrip and ToolTabStrip are created dynamically and when they initialize they call their Scale method. The tool window, the user control, and also all other controls added to it are created only once. When you undock the window a new tab strip is created and the existing controls are added to it. When we load the tab strip we call PerformRadAutoScale which calls the stip's Scale method. Calling Scale propagates to the child controls causing additional scaling to the Microsoft controls. RadControls don't have issues because we have logic to check the scaling of the window and we don't allow double scaling.

As a workaround, we can create custom tab strips and override the ScaleChildren property to return false.

this.radDock1.DockTabStripNeeded += this.RadDock1_DockTabStripNeeded;
private void RadDock1_DockTabStripNeeded(object sender, DockTabStripNeededEventArgs e)
{
    if (e.DockType == DockType.ToolWindow)
    {
        e.Strip = new MyToolTabStrip();
    }
    else
    {
        e.Strip = new MyDocumentTabStrip();
    }
}

public class MyToolTabStrip : ToolTabStrip
{
    protected override bool ScaleChildren => false;
}

public class MyDocumentTabStrip : DocumentTabStrip
{
    protected override bool ScaleChildren => false;
}

All you need to do to reproduce the issue is to run, close, run, close several times - maybe 5 or more times, and observe the floating windows increasing in size.  

When custom controls that are containing SplitContainers and TableLayoutPanels are used in RadDock there is invalid resizing behaviour.
The underlying controls are not properly resized when the entire form is resized as well. 
The issue exists only on Windows 7 x64 machines. 

Workaround:
Use RadLayoutControl instead of the TableLayoutPanel.

To reproduce:

Sub New()
    InitializeComponent()

    Me.WindowState = FormWindowState.Maximized
    Dim leftWindow As ToolWindow = New ToolWindow()
    leftWindow.Text = "Left Window"
    Me.RadDock1.DockWindow(leftWindow, DockPosition.Left)
    leftWindow.DockState = DockState.AutoHide
End Sub

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    If Me.RadDock1.DockWindows.ToolWindows.First().ParentForm IsNot Nothing Then
        Me.RadDock1.DockWindows.ToolWindows.First().ParentForm.Show()
    End If
End Sub

Workaround: maximize the form after the auto-hide popup is shown:
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    If Me.RadDock1.DockWindows.ToolWindows.First().ParentForm IsNot Nothing Then
        Me.RadDock1.DockWindows.ToolWindows.First().ParentForm.Show()
    End If
    Me.WindowState = FormWindowState.Maximized
End Sub

To reproduce:
- Add a document window uppopn a button click. Put the button inside a tool window.

Workaround:
Use ActiveWindowChanged event.

Please refer to the attached sample project and follow the steps illustrated on the gif file.

Workaround: you can control which items to be closed:

public RadForm1()
{
    InitializeComponent();
    ContextMenuService menuService = this.radDock1.GetService<ContextMenuService>();
    menuService.ContextMenuDisplaying += menuService_ContextMenuDisplaying;
}

RadDockLocalizationProvider localizationProvider = RadDockLocalizationProvider.CurrentProvider;

private void menuService_ContextMenuDisplaying(object sender, ContextMenuDisplayingEventArgs e)
{
    foreach (RadItem item in e.MenuItems)
    {
        if (item.Text == localizationProvider.GetLocalizedString(RadDockStringId.ContextMenuCloseAll))
        {
            item.Click += item_ClickContextMenuCloseAll;
        }
        else if (item.Text == localizationProvider.GetLocalizedString(RadDockStringId.ContextMenuCloseAllButThis))
        {
            item.Click += item_ClickContextMenuCloseAllButThis;
        }
    }
}

private void item_ClickContextMenuCloseAllButThis(object sender, EventArgs e)
{
    foreach (DockWindow dw in this.radDock1.DockWindows)
    {
        if (dw == this.radDock1.ActiveWindow)
        {
            continue;
        }
        dw.CloseAction = DockWindowCloseAction.Hide;
        dw.Close();
    }
}

private void item_ClickContextMenuCloseAll(object sender, EventArgs e)
{
    foreach (DockWindow dw in this.radDock1.DockWindows)
    {
        dw.CloseAction = DockWindowCloseAction.Hide;
        dw.Close();
    }
}

To reproduce:

Scenario 1:

ToolWindow window1 = new ToolWindow();
window1.Name = "window1";
this.radDock1.DockWindow(window1, DockPosition.Left);

ToolWindow window2 = new ToolWindow();
window2.Name = "window2";
this.radDock1.DockWindow(window2, window1, DockPosition.Right);

window1.TabStrip.SizeInfo.SizeMode = Telerik.WinControls.UI.Docking.SplitPanelSizeMode.Relative;
window1.TabStrip.SizeInfo.RelativeRatio = new SizeF(0.7f, 0);

The expected result is that "window1" takes 70% of the container hosting "window1" and "window2".

Scenario 2:

ToolWindow window1 = new ToolWindow();
window1.Name = "window1";
this.radDock1.DockWindow(window1, DockPosition.Left);

DocumentWindow doc1 = new DocumentWindow();          
this.radDock1.AddDocument(doc1, window1, DockPosition.Right);
window1.TabStrip.SizeInfo.SizeMode = Telerik.WinControls.UI.Docking.SplitPanelSizeMode.Relative;
window1.TabStrip.SizeInfo.RelativeRatio = new SizeF(0.7f, 0);

The expected result is that "window1" takes 70% of the container hosting "window1" and the document window.

Workaround: use the SplitPanelSizeMode.Absolute as below:
ToolWindow window1 = new ToolWindow(); 
DocumentWindow doc1 = new DocumentWindow(); 

private void RadForm1_Load(object sender, EventArgs e)
{
    window1.Name = "window1";
    this.radDock1.DockWindow(window1, DockPosition.Left);
            
    this.radDock1.AddDocument(doc1, window1, DockPosition.Right);
   
    window1.TabStrip.SizeInfo.SizeMode = Telerik.WinControls.UI.Docking.SplitPanelSizeMode.Absolute;
    window1.TabStrip.SizeInfo.AbsoluteSize = new Size((int)(this.Size.Width * 0.7),0);

    this.radDock1.SizeChanged += radDock1_SizeChanged;
}

private void radDock1_SizeChanged(object sender, EventArgs e)
{
     window1.TabStrip.SizeInfo.AbsoluteSize = new Size((int)(this.Size.Width * 0.7),0);
}

To reproduce: open the attached sample project.

1. Drag the documentwindow1 as floating
2. Select tool window 2 
3. Select the floating documentwindow1. The ActiveWindowChanging event will be fired twice.

Please refer to the attached sample project. Click the "show" button to open a new MDI child form. Then, press the "close" button. In the Output tab you will notice that the FormClosing/FormClosed events are fired twice.

Workaround: use the RadDock's DockWindowClosing and DockWindowClosed events.

To reproduce:
Open the attached project and press Ctrl+ Tab in the first text box. Since the textboxes are accepting the Tab, Ctrl + Tab should move to the other control.


Workaround
// RadTextBox
private void TextBoxItem_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
    if ((e.KeyData & Keys.Tab) == Keys.Tab && (e.KeyData & Keys.Control) == Keys.Control)
    {
        e.IsInputKey = true;
        var item = sender as RadTextBoxItem;
 
        this.SelectNextControl(item.HostedControl, true, true, true, true);
 
    }
}
//RadTextBoxControl
private void RadTextBoxControl1_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
{
    if ((e.KeyData & Keys.Tab) == Keys.Tab && (e.KeyData & Keys.Control) == Keys.Control)
    {
        e.IsInputKey = true;
        this.SelectNextControl(sender as RadTextBoxControl, true, true, true, true);
 
    }
}