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User looses data from uml project during uml module uninstallation. Uninstallation process should suggest user to save uml projects. The same as it suggests to save modified diagrams. P1 because correct actions lead to user's data loss.
bug is not reproducible anymore. reason of this instability is not known. close this issue as invalid. will try reproduce later again.
verified in netbeans-hudson-trunk-980-full (Build 070620) it is now suggested to save project. related issues are filed separately