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I was using 5.0 Beta 2 for editing and got this deadlock, sort of at random. I can't really tell which component is at fault, though it might be java/project. Just before this happened, I had switched to a command shell and copied a new revision onto a file that was open in the editor. The deadlock happened when I switched back to NetBeans, it popped up a blank dialog with the title of "Question" and went unresponsive, except that I could move the dialog around (but not close it). Thread dump attached.
Created attachment 27884 [details] deadlock thread dump
Reassigning for evaluation.
*** This issue has been marked as a duplicate of 66783 ***