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I started up NB and updated modules, then I added a new project and did some debugging work, mounting several directories and jar files along the way. I eventually exited, and then restarted NB. When I started up again, I got a dialog showing this exception before I could do anything else.
Created attachment 8391 [details] exception stack trace
Created attachment 8392 [details] ide.log file from specified location
Reassigning to core/window system.
*** This issue has been marked as a duplicate of 28307 ***
verified, closed - it's duplicate.