Okay this is a weird one, and first I've encountered it.
Latest firmware and wheezy just updated.
When I close X Windows (with logout method) I arrive to a black screen, can't change to any other console. I can still ping the pi on the network. But attempting a ssh login, I get username and password prompt... then it just hangs. Putty connection doesn't die, it just sits there and never gives me the terminal.
At a bit of a loss with this one. I will try it again with serial console later and see if I can trace any more info.
???