I think I have reported this before, but it has been awhile. The option to turn on "Bump map buildings" also makes all concrete surfaces very bright. It only does this for some video cards, though. The cards that either don't or cannot support bump mapping do not make the same difference. This gives an advantage to people with a better card, because you can see aircraft or vehicles on the concrete from much further ranges. Also, it should not do this. Airfields should be a little hard to see, not really easy. With this option active they appear to be almost alabaster they are so bright.