BuddyPress.org

hi!

I have installed wp mu 2.7, it works great, i can creat new blogs and users, subdomens work too, but when I loaded bp1 beta 2(in mu-plugins), admin panel doesnt work, I also loaded member-themes in wp-content and buddypress-home in themes, and 777 on httpdocs and wp-content, what is wrong? thanks