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It just refuses to die. I noticed that it kept showing up in my Source Editor every time I launched the IDE. I thought I tried to be clever and docked it into it's own window, now that window opens every time I launch the IDE. I'm not getting any exception reports and the log is empty. The textual editor closes with no problem.
I am sorry, I do not understand rigth. Please, could you describe your problem step by step? [Is it right, that you clouse Tree Editor, exit IDE, start IDE and then Tree Editor is again opened?] Try to start NetBeans with '-J-Dnetbeans.debug.xml=true'. Thanks.
I am sorry for previous comment. I tried it now and it is clear. It will be fixed soon.
It looks like Window System problem. Try to remove your userdir and problem should not appear again.
VERIFIED
Resolved for 3.4.x or earlier, no new info since then -> closing.