The TableCellProperty.Padding property of the "TableNormal" StyleDefinition doesn't take effect in the UI. The same is valid for the TableProperties.CellPadding property.

To work this around, you can manually set the Padding property of all TableCell elements in the RadDocument.

 var cells = radDocument.EnumerateChildrenOfType<Telerik.Windows.Documents.Model.TableCell>();
 foreach (var cell in cells)
 {
     cell.Padding = new Padding(10);
 }

To reproduce set he following properties: 

MouseSelectionHandler.DoubleClickTime = 1000;
MouseSelectionHandler.MouseDragThreshold = 2;

MouseSelectionHandler.MouseDoubleClickThreshold = 60;

ArgumentExeption when typing a specific combination with the new Japanese IME. 

Steps to reproduce:

1. make sure new IME is used.
2. Type "bcd" + space + "t -> argument exception occurs. 

Expected should work like in the standard text box.