I had that happen with Diamon File GL 1000 Pro (aka as a permedia II card).
I just put the older X server back on and everything works again.  It
appeared that the different color layers were being displayed individully.
I didn't want to deal with trying to fix it at all.  It was a buddies
computer and it was more important that it start working correctly RIGHT NOW
that it would be to try and gain a bit of speed by running the latest
greatest software.

Brian Cluff
----- Original Message -----
> I've got a RH6.1 install and I installed the same video drivers from 3DFX.
> The only problem I've got with them is when I shut down X.  When the
screen
> shades out in four section right?  One of the sections is black not
shaded.
> Wierd huh?  Anyone else have that problem?