This sounds like the error I got, except I just upgraded from Ubuntu
AMD64 9.04 to 9.10. Sorry, I don't know where to find the log file for
this to post here...
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npviewer.bin crashed with SIGSEGV
https://bugs.launchpad.net/bugs/141613
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I was having this issue with Ubuntu 8.04 + Compiz, but I have fixed the problem:
I realized that compiz was keeping its settings in a flat file instead of GConf.
Open the Add/Remove Applications Manager
(Applications Add/Remove...)
Next to Show: select All available applications
Search for