I just bought OA from steam, and after downloading it I get the error about compiling pixel shaders. As far as I can tell, this is a fairly common problem, but none of the fixes I've found so far online have worked. I have opened steam as an administrator, verified the integrity of the game cache, deleted it from the registry and restarted, checked permissions, and re-installed the entire game. Arma II works fine, but Operation Arrowhead won't. Earlier when I verified the integrity of the game, it told me something like "1 file needs to be reacquired," but now it won't work at all so I can't get the exact wording. Any ideas?
