i never had any lockups with it, and the updating has been working, but then again i just sat there and let it update.
on a few occasions the framerate took a huge nose dive to slide-show speed, but it was because i was looking down an extremely long hallway, with tons of enemies and explosions and what not. i think it just had a hard time rendering for a few seconds.
other than that it's been smooth sailing. beautiful game.