When I use EXP and EXP2 fog filters with my Sky-dome app everything looks fine but when I try LINEAR the scene loses all of its shading and is rendered in only two colours, I init the fog as in NeHes fog tutorial.

sorry i cant be of help but i remember encounting someit like this with linear not working but exp does with fog, on a vanta recently do u have a tnt based card it might just be a problem with the card/drivers