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When I upgraded from Sun One Studio 4 update 1 Community Edition (build 020923), the first time I invoked the IDE as specified for the installation from .zip a NullPointerExeption occurred and the error message requested that I report this problem. Subsequent invocations of the IDE did not cause a NullPointerExeption. I have not noticed any other undesirable behavior. This problem is very similar to the issue with ID 17488. You would get more and better error reports if the error message contents could be copied to the scratch pad.
Created attachment 10844 [details] IDE log file
It is Swing/JDK issue. See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4959489. Fixed in JDK 6.0.