If you previously experienced glitches or crashes using an AMD graphics card, this update should fix these. Also, if you set the game to graphics compatibility mode to make it work on your AMD card, you should now be able to turn that off - and turn on lighting effects, and get a faster, prettier game.
Note that this fix is really a workaround for a bug (or multiple bugs) in the AMD driver. I'm talking to AMD as well and hope they'll eventually resolve it on their end.
Changed files in this update