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This locks up my NetBeans
Created attachment 78322 [details] Stacktrace of lock up
Please generate full threaddump (http://wiki.netbeans.org/GenerateThreadDump) when the IDE is frozen and attach it here. The stacktrace you attached shows only one thread (AWT), which is not enough to diagnose the deadlock. Thanks
Unfortunately there is just a part of the deadlock. It's impossible to say who is the second participant. Probably some invokeAndWait() or Children.MUTEX.