Official Release of WordPress 3.0 “Thelonsious” (Video)
The new version is a combination of WordPress and Wordpress Multi-User (WPmµ). Bringing the best of blogging and multiple blog platforms together.
WordPress MU – BuddyPress and Events Manager *Bug Fix*
So, in my test version I uninstalled version 2.2.2 and reinstalled 2.1. Guess what it worked again.