About 4 months ago when I first got my mbp I could join a webex using firefox2 just fine. Then about 2 months ago I no longer could join a webex. I can start the process by enter the webex meeting number or clicking on the link within the email. The login screen will appear where I enter my info and meeting password. Finally the "Please wait Meeting starting" screen appears but nothing loads after that. I have tried to completely uninstall firefox and reinstall with the same outcome. Any suggestions????