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Created attachment 102685 [details] Thread dump of blocked NB In NetBeans 6.9.1 I double-clicked on a component that extends JPanel and I got stuck on a deadlock between these two threads: - AWT thread, name is "AWT-EventQueue-1" - a RequestProcessor thread, name is "GUI Builder" Attached there is thread dump saved with JVisualVM.
This is a temporary problem of JDK. You should use either JDK 6 update 20 or JDK 6 update 23 (there is a bug in updates 21 and 22). *** This bug has been marked as a duplicate of bug 187697 ***