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A deadlock sometimes occurs when a form is being opened (or more forms simultaneously) and some other interaction with IDE UI is done together. Attached two thread dumps (first happended on W2K, second on Linux).
Created attachment 817 [details] thread dump #1
Created attachment 818 [details] thread dump #2
fixed in release32 and trunk
better described http://www.netbeans.org/issues/show_bug.cgi?id=10678
Target milestone -> 3.2