I'm having the exact same problem too. As Zamul mentions, it seems to alternate from bad to good on game start. (For what it's worth, I'm loading an autosaved game)
Oddly enough, if I turn off advanced lighting, by dropping the slider to zero, the graphics get worse! Here's an example:
--LordPixie
Yeah you don't want to touch the slider, you need to uncheck "Advanced Lighting" at the bottom center. I was getting the same problem - blurry graphics normally, black screen if I take the slider down, but it's fine if I just uncheck the advanced lighting box at the bottom.
Also, looking at your screenshot makes me think:
It is pitch black. You are likely to be eaten by a grue.
