Seeing "Page Not Found" on Activity, Members, Groups & Blogs tabs

I have installed the latest version of BuddyPress on a WPMU 2.9.2 installation.

However, the Activity, Members, Groups, and Blogs tabs all show "Page not found" errors.

I tried deactivating BuddyPress, resetting the permalinks, and then reactivating BuddyPress, but still am receiving the errors.

Thanks for any help you can provide.