A possible workaround has been demonstrated in the attached project.

Resizing a RadPane's splitter while its Header's or Content's ContextMenu is opened leads to incorrect resize

Depending on the current layout of the document, invoking SetPosition() for a specific location might result in positioning the caret on the line prior to the expected one.

Steps to reproduce:

• Create a document using the following code:

radRichTextBox.Insert("one: ");
radRichTextBox.Insert(Environment.NewLine);
radRichTextBox.Insert("two: ");
radRichTextBox.Insert(Environment.NewLine);
radRichTextBox.Insert("tree: ");
radRichTextBox.Insert(Environment.NewLine);
radRichTextBox.Insert("four: ");
radRichTextBox.Insert(Environment.NewLine);
radRichTextBox.Insert("five: ");
radRichTextBox.Insert(Environment.NewLine);
radRichTextBox.Insert("seks: ");
radRichTextBox.Insert(Environment.NewLine);
radRichTextBox.Insert("seven: ");
radRichTextBox.Insert(Environment.NewLine);
radRichTextBox.Insert("eitgh: ");
radRichTextBox.Insert(Environment.NewLine);
radRichTextBox.Insert("nine: ");
radRichTextBox.Insert(Environment.NewLine);
radRichTextBox.Insert("ten: ");

• Place the caret at the end of the "nine: " line
• Invoke SetPosition():

radRichTextBox.Document.CaretPosition.SetPosition(radRichTextBox.Document.CaretPosition.Location);
radRichTextBox.Focus();

Observed: The caret is positioned after "eitgh:"

Expected: The caret shouldn't change its position

As Windows application use a common clipboard, there is a potential risk for causing a ComInterop exception while copying data from RadGridView. Workaround: Process exceptions in application logic

The indicators and the markers are not updated when the data is changed at runtime.

Workaround:
Manually invalidate the arrange of the panel that holds the sparkline's markers. You can do that by finding the ScatterPanel control in the visual tree of the sparkline and then calling its InvalidateArrange() method. Call the InvalidateArrange() method at the moment when the data of the sparkline is updated. 

var panel = this.sparkline.FindChildByType<ScatterPanel>();
if (panel != null)
{
    panel.InvalidateArrange();
}