I just upgraded my OS from Lion to Mountain Lion. To my surprise after booting up from the install, Back to my Mac and iCloud do not work. When I try to log in to both of them with my Apple ID and password, it tells me the password is incorrect. However, I can log in to iTunes and everything else with the same password just fine. Is this happening to anybody else? I have tried changing my password, but that didn't work. Any suggestions?