I changed the last
http://gaga.com/forums
to
http://forums.gaga.com
and that seems to work

Welcome to the vBulletin support forums! In our community forums you can receive professional support and assistance with any issues you might have with your vBulletin Products.
Useful Links for Guests:
If you are having problems posting in the relevant areas for your software, please see this topic.
Name of your forum. This appears in the title of every forum page. | |||
Core URL | |||
URL of your forum's core. Note: do not add a trailing slash. ('/') |
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Frontend URL | |||
URL of your forum's frontend. Note: do not add a trailing slash. ('/') |
http://forums.gaga.com | ||
Frontend Login URL | |||
This will only be used if you wish to require https logins. You will not need to change this setting most of the time. | http://gaga.com/forums | ||
Always use Forum URL as Base Path |
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