I think I may have experienced the same problem with buddypress. The only solutuion I’ve found so far is to remove “position: relative;” from most of the css file attributes.
This solution lands me back at the standard wordpress branded logged out screen. How do I make it redirect the user to a logged out version of the bp homepage. Also, does this same solution apply for the username/logout area directly below the adming bar on the right side of the page?