Oh I think I know nwhat you are talking about now, I had this problem only a few times but when I logged out and came back on it was fine. But if it is with the Graphics the only thing I would know what to do is update your video card.
You can do so at this site.
http://game.amd.com/us-en/drivers_catalyst.aspx I hope this helps this time. If not it is probely something wrong with the game and you might have to call Disney. But I hope this works =D
Ben Lockshot ~Gm of GoT~ Lvl 50