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I have created a number of custom Swing components, which I added via Netbeans' Palette manager (NB 6.9.1 and 7.0m2). Although they appear correctly and I can add them to forms etc., when I shut down Netbeans and then start it up again, the designer will no longer load. NB hangs (becomes unresponsive) while opening the designer, even on a newly created form with no components on it. I can restore functionality by deleting that Palette category, loading the form, then re-adding all components again via Palette manager. The unresponsiveness happens while NB displays "Loading form" in the status bar. The IDE log does not contain anything to indicate what's going on. The IDE never recovers from this state.
This does not occur with NB 6.8 (same JAR file, same sequence of events)
What JDK do you use? If it is JDK 6 update 21 or update 22 then this issue is a duplicate of issue 187697. If you use a different JDK then, please, attach thread dump.
Yes, it's 1.6.0_21-b06 I will test it with update 23 early access to verify.
Confirmed - it works with jdk6u23 *** This bug has been marked as a duplicate of bug 187697 ***