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I experienced a fatal deadlock while using NB 4.1. I ended up having to kill and restart NetBeans. This may be related to the VCS module -- I was editing a java3d file that was under CVS control when the hang happened. The thread dump shows that the the VCS module was waiting for a lock. This may be related to some of the deadlocks reported by Paul Byrne in Issue 61255 -- I know some of them were VCS-module-related. The thread dump is attached. I had just finished a refactoring operation (which thankfully had saved everything) when the deadlock occurred.
Updated Version to 4.1.
Created attachment 23533 [details] Thread dump
*** This issue has been marked as a duplicate of 59194 ***