JDev hangs after click on event-tab in MW

Hi all,
I have problem with definition an descriptor-event in MW in JDev 10.1.2:
When I define "tab" event on descriptor (none method selected yet), save and close JDev, after opening JDev and click on this "tab" event JDev hangs.
Only Ctrl+Alt+Del works.
Any idea?
Thanks.
Jara

I am having a similar problem using the mapping workbench inside JDev 10.1.2.18.38
In one of my pojo classes I extend DescriptorEventAdapter and implement the following method.
public void postUpdate(DescriptorEvent event) {
Rebuild, refresh, click on the event tab in the mapping workbench and it hangs. Have to Ctrl+Alt+Del.

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JDev hangs after click on event-tab in MW

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