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Based on Bug 209965, I needed to downgrade my ide. However, the last time I closed Ide build #201203210400 there where several projects open, 3 of which had been modified and updated. That's fine. But after I restarted the ide using build #201202240400, I got multiple "Open Project Warning" dialogs that popped up saying "The project was created with a newer version...", etc. The problem is that neither the ide nor any of the dialogs would respond to user input. So it seems that somehow the mulitiple dialogs (modal?) prevented each other from getting user input. The workaround was to move all of my source directories out of the way so that netbeans could not find them and then open one at a time (which yielded a single "Open Project Warning" dialog), which operates correctly. So perhaps to repeat: - open three projects in the ide - close the ide - modify the configuration.xml so that the version number is too new. - restart the ide This last step should open the three remembered projects and pop up a dialog for each and none will respond.
*** This bug has been marked as a duplicate of bug 209508 ***
Todd, if you see deadlock, please, attach thread dump to simplify evaluation. http://wiki.netbeans.org/GenerateThreadDump