Playing as a Monk (lvl12) on The Broken Blade quest, I entered the Crypt of the Ancients and paused my game.
I left my game inactive for about 15 minutes and when I resumed it I could not move.
Clicking on the floor produced a multitude of those little orange circles without any motion.
I could access all menus to view but attempting to change any settings regarding my character or follower did nothing.
I fiddled with it until it crashed to desktop, restarted the game, and my character was fine.