Strange lines with differents colors

["Cristophe Coutand" <cristophe.coutand@nbs.nera.no>]

I've got a ATI Rage LT Pro graphic card and I have some troubles using
Gnome.
When I run the applications like Nautilus or Mozilla  it appears on my
screen some very strange lines with differents colors.
I tried several configurations for my graphic card but it still the same
thing. Even if I use it in 16bits mode I have the same
problem. I found anything about that on the web and I wonder if it's a
problem with xfree or with Gnome.
Does somebody have a idea ?

Thanks
Christophe.