I recently upgraded a 2010 MacBook Pro to Mountain Lion, and it's worked fine for the most part. Today, however, upon waking up from sleep, the laptop won't go past the login screen. I enter the correct password, hit Enter... and the focus on the password box goes away, and nothing happens.
Note that the password box doesn't shake, as it does when the password is incorrect. I'm entering the right password, it just won't dismiss the login screen.
Anyone else have this problem, and find a solution other than a hard reset?
(Unlike this question, three-finger swiping accomplishes nothing.)