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BPMN2-Modeler/KnownIssues
If you have discovered a bug or "strange behavior" in BPMN2 Modeler, it may already be a known issue. Please check Bugzilla for a list of bugs and enhancements that have not yet been addressed. If you feel the bug is important enough to warrant more immediate attention, please vote for it.
This page will be updated periodically as we test and discover bugs that may be beyond our control. If possible, we will suggest workarounds or quick fixes here that may help get you over the hump.
Unhandled event loop exception, Item not added
This may be caused by a Platform UI issue which has been reported in bug 287508. This was originally discovered when editing a list item in a Property Sheet tab (e.g. a Process Property in the Data Items property tab). The deeply nested SWT structures of the Detail Panel causes a Windows kernel stack overflow and throws this exception.
The workaround is to use popup dialogs instead of the Details Panel. In the User Preferences select BPMN2->Editor->Behavior-> Use a popup dialog instead of Details Panel to edit List items.
Eclipse freezes when opening a BPMN file on Archlinux
See the description and workaround in bug 406080.