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When drag and drop is done with several fast movements it's causing JS errors
(windows XP, firefox 3.6.3 +firebug)
I can verify these errors also (tested on Mac OS X/Firefox 3.6.3). Created a ticket #4559 for this issue.
Thanks for reporting!
When I was stress testing the server validation with DnD I found some JS errors, after a while I saw red Internal Server Error popup.
In case somebody would like to go through the logs it happened few minutes ago.