@r-a-y
14 years, 5 months ago
When you upgraded WPMU to WP 3.0, did you correctly upgrade? http://developersmind.com/2010/06/17/upgrading-wordpress-mu-2-9-2-to-wordpress-3-0/
It also sounds like your BP install is corrupted. Here’s a guide to upgrade BP: https://codex.buddypress.org/getting-started/upgrading-from-10x/
