Re: BuddyPress plugins and theme not loading
As Burt has requested, we would like to see if there are any commonalities between your issue and Hempsworth’s issue. Web server (Apache, Lighty, Nginx), version of PHP, and WPMU install method (subdirectory or subdomain) would help us narrow this down a bit.
Actually Hempsworth must have mod_rewrite installed and loaded as his Lighty config file is properly rewriting his WPMU URLs. WPMU is functioning for him and since doing a clean reinstall of BuddyPress, he was able to activate it.
But now he has a different issue–a strange missing-theme files issue.