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Following deadlock occured when working with projects, see attachement.
Created attachment 9616 [details] full thread dump
Seems to be collision between ProjectMemberList and settings framework.
ProjectMemberList's synchronization model changed. Please, reopen if it appears again.
VERIFIED
As described in http://www.netbeans.org/servlets/ReadMsg?msgId=619519&listName=nbdiscuss the current work on projects prototype has been stopped. Marking issue as CLOSED.