In some maps my sky is completely black with a white hue around it, if i turn off bloom the white glowing hue goes away but the sky stays black, this only happens in certain maps but not all of them. when i look straight up a small space of the sky is normal. is it my video card or the game? i have a nvidia 7800 gtx...lol that might be it but if its not i dont want to have to go out and spend the money HELP PLZ!