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Started NetBeans with several J2SE projects open and one NetBeans (non nbsrc) module project open. Clicked the expansion handle on the NetBeans module project. UI was frozen, deadlock detected at bottom of attached thread dump - synchronization in OpenProjectsList is the problem. Seems to be the logging code that is causing it (via Node.toString() [!!]), but clearly there is something wrong with the way synchronization is being done here.
Created attachment 79094 [details] Thread dump
Jardo, your regression from issue 128692.
*** This issue has been marked as a duplicate of 160512 ***