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I'm using the 4.0 dev build dev-200310030100. After using the IDE for a while, I did a compile and the thing froze on me. I suspect a deadlock based on the stack trace. Unfortunately, I can't reproduce it. I'll attach the stack trace.
Created attachment 11819 [details] stack trace of hang
Oops, I just remembered, the compile worked OK, I hit a ctrl+n after the compile and that's probably what caused the problem (obvious after looking at the stack trace too!).
Your thread dump does not reveal any deadlock. Either it is incomplete or you should give the ide more time to complete the job. Please reopen the issue with new thread dump if you encounter it again.