Hello Hans Peter,
Thank you for your feedback. The behavior you are describing is indeed not expected. The reason for this issue is the fact that since our beta release we are introducing new DragDrop mechanism that will provide more fluent and intuitive API as well as improved support for many specific cases. While it also work with the existing API there might be still some issue we are trying to resolve.
We would greatly appreciate if you can share some additional information about the scenario in which this occurs (ideally if possible sending us sample project by opening support ticket).
P.S. You can still switch to the legacy DnD logic by setting RadDragAndDropManager execution mode to Legacy in application constructor.
All the best,
the Telerik team
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