BuddyPress.org

Had the exact same issue yesterday when I upgraded. Thought it was a browser malfunction at first (I was at work and using IE *gag*), but in the end I fixed it the same way as David with a fresh database. I checked everything I could think of and starred at code until the page got wavy and I have utterly no input as to what caused it, but there’s something in the upgrade that seems to randomly do this. No idea.