[Lance Willett]

Mypop, when you are in the MU admin area — go to the last menu item (it should be labeled “BuddyPress”). Click “Component Setup” and make sure that bbPress Forums is enabled.

Then click the link in that same admin menu that says “Forum setup”, and make sure the settings there are correct.

I noticed when I recently upgraded my BuddyPress to the latest trunk (rev 1324) that those forum settings were empty, so I had to enter them again (URL, username, and password).