Actually, I've noticed something very strange, no matter how many times i change the in game settings they always change themselves to something weird.
For example I tried turning down interior and exterior shadows to 8, played for 15 minutes.
When i went back into the menu, exterior shadows was at 10 and interior was at 2.
This happens with all the sliders.
My specular distance went from 40 to 100, the various Actor fades and such were all at seemingly random numbers as well.