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http://linuxsagas.digitaleagle.net/2009/10/02/webex-works-again-in-ubuntu-9-04/
http://linuxsagas.digitaleagle.net/2009/10/02/webex-works-again-in-ubuntu-9-04/
I was having trouble getting WebEx to work after I upgraded to Ubuntu 9.04. After opening a support ticket with WebEx, I finally figured out the problem was with my Java configuration directory. When I removed that, it started working!
mv ~/.java ~/java_backedup
Here are some more details for troubleshooting: