I suppose that you use the obsoleted RadDragAndDropManager and that's why the colors are hard to see. We've changed the built-in drag drop logic of the RadTreeView and now we are using a new DragDropManager. In order to take advantage of it you need to set theTreeViewSettings.DragDropExecutionMode property to New. You can take a look at the Drag And Drop article in the RadTreeView documentation where all new features and functionality of the DragDrop in the control are further described.
So, all you need to add is:
I hope this information will help you and don't hesitate to ask if you have any other questions.
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