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Created attachment 101508 [details] class file of project stated in Description above Lockups experienced when switching from Source to Design. Each time Windows Task Manager required to shut app down. My system: MP = 3.1GHz with 2GB RAM and oodles of hard dirve space. New Project = Java Application (latest JDK update 21) consists of JFrame covered by JPanel and a JMenubar with one menu and one menu item. A label, a combo box with 10 pre-installed items and another panel. The project compiles and runs fine initially. When project closed and then reopened and an attempt is made to switch from Source to Design, the IDE locks up. No problem doing same operation on NetBeans V6.8. All other projects which I have built on V6.8 have the same effect when loaded in V6.9 or V6.9.1. I have uninstalled V6.9.1 and re-installed about three times without making any difference.
It seems to be a duplicate of issue 187697. Unfortunately, I cannot verify that without a thread-dump. Could you, please, attach a thread-dump taken during the lockup/deadlock/freeze? Thank you in advance. See http://wiki.netbeans.org/GenerateThreadDump if you are not sure how to generate a thread-dump.
Created attachment 101726 [details] Thread Dump Using jstack after lockup
Thank you for the thread dump. It confirms that this issue is a duplicate of issue 187697. *** This bug has been marked as a duplicate of bug 187697 ***