Watching the SDN forums, I saw repeated reports of a crash in AWT, in disposeImpl, when popping complex windows:

http://forum.java.sun.com/thread.jspa?threadID=650758&tstart=75

Could be a dup of http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4867453 . Maybe it's a user error; I can't tell.

In any case, somebody should close this bug as a dup and/or fix it, and kindly post a reply on the forum.
(intentionally blank)