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This is with 4.0 beta 2 on Solaris with J2SE 5.0. I had just started editing an existing project and had opened a file within it, when the GUI locked up. kill -QUIT detects a deadlock between the thread "Default RequestProcessor" which is holding a BtreeDatabase and attempting to lock a BtreeStorage, and the thread "AWT-EventQueue-1" which is the opposite. The stack trace including detected deadlock is attached.
Created attachment 18379 [details] Stack dump including detected deadlock.
Reassigning
This deadlock was fixed some time ago. You can download the recent q-build to get rid of it.
Verified in 4.2