See thread dump excerpt. Randomly occurred during startup in 070326.
Created attachment 39987 [details]
Of course the attachment was a thread dump, not a stack trace as such.
Created attachment 40387 [details]
A similar thread dump
I think this was fixed a while back; it was the editorkit settings code.
Reassigning this issue to newly created 'ruby' component.
Changing target milestone of all resolved Ruby issues from TBD to 6.0 Beta 1 build.