I experienced the same issue, so thought I’d chime in with my experience. With the settings on my office server, I have to manually updated the files on my site. I had the same problem where everything seemed fine with the install, but editing posts and pages wouldn’t work (the body of the edit page wouldn’t appear).
I re-uploaded all the files, and that fixed it—I’m pretty sure I forgot to add the new twentyten and twentyeleven theme files the first time around, which I think might be used for the administration pages. (I did this after trying the other steps that freakingid mentioned, and it was re-trying the upgrade upload that worked for me.)
