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[Netbeans 55 20060421, jdk 1.6.0 b79] Steps: I opened an existing EJB project, expand config node and double click on persistence.xml. In thread dump you can see that threads AWT-EventQueue-1, XmlMultiViewDataSynchronizer RequestProcessor wait for waiting on <0x73322e70> (a org.openide.windows.CloneableOpenSupport$Listener).
Created attachment 30106 [details] thread dump
Seems to be a duplicate of the issue 74362. *** This issue has been marked as a duplicate of 74362 ***
Verified duplicate