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I have a large number of treefs mounts. The java/src mount was closed. I clicked on it to expand it. It expanded and displayed the "org" node, and then the IDE locked up. Stack trace attached. AFAIK it looks like at org.netbeans.modules.treefs.RepManager.waitFinished is blocking the AWT thread; source parsing is also holding a lock to open a zip file, so I'm not sure exactly what is going on.
Created attachment 10350 [details] stack trace
Tim, I guess you are using old version of treefs upgrade. *** This issue has been marked as a duplicate of 22734 ***