I have the "blue curtain" problem in fs2002. When the visibility is reduced, instead of a nice haze, a sharp blue curtain appears. I run fs2002 on a Dell Inspiron 4000 with an ATI Mobility 3 video card. In my case the disable TABLE FOG trick that works with ATI 128 doesn't seem to have any effect.
Has anyone managed to get proper fog on a machine with an ATI mobility card?