Dragging a portlet with a nested reorderer from the right hand column and dropping it back on the right hand column will cause the avatar to freeze where it is. The page will still behave as though the pointer is dragging the avater but It does not allow you to drop the portlet anywhere.
Steps to Reproduce:
1) Open the Uportal demo page on the daily build site:
2) Drag and drop the Portlet containing the lightbox from the left hand column to the right
3) Attempt to drag and drop the same portlet on any drop target in the right hand column. Notice that the avatar freezes where it was dropped.
4) Move the pointer to various locations on the screen. Notice that the page still behaves as though you are dragging the avatar, but you cannot drop it.