Two possibilities:
(1) Your upgrading from 0.71a -> 0.8-beta and your browser has cached
index.html. Refresh your browser and it should work. See
http://code.google.com/p/bigbluebutton/issues/detail?id=998
(2) In following the installation instructions, you omitted installing
bbb-demo, which is the code that implements joining a room from the
homepage. See
http://code.google.com/p/bigbluebutton/wiki/08InstallationUbuntu#5._Install_API_Demos
Regards,... Fred
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