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might pertain to bug 73467 http://www.netbeans.org/issues/show_bug.cgi?id=73467 After rev eng a uml project, the ide does not refresh the ui. The menus respond and what is executed actually happens, but this is not reflected of in the ui. Note that if the ide is minimized (not simply hidden), then upon being restored the ui is refreshed and begins responding again. Note that this only occurs in MDI mode. In SDI the ui seems to respond fine.
*** This issue has been marked as a duplicate of 73624 ***
closing