Not sure if this is shadow mapping, but i'm not familiar with all those technical terms.
Anyway, I got a weird problem with the shadow/lightning in the game.
When i walk around a room, the shadows flicker and change dramatically even though i only make a few movements.
This happens most noticeably with the lantern. When i got it up and move just an inch with the mouse, the shadows in the room suddenly block half my screen.
ATi X850XT
Settings:
Uploading a movie to youtube currently where you can see what i'm talking about.
-edit-
Movie:
http://www.youtube.com/watch?v=XP9-kY54zKM