when running many X apps under gnome-desktop errors are reported :-
"cannot get enough colors"
and then they terminate.
this includes Xni(most important) and xearth.
desktop is 1024x768x16bit on a 4Mb Trident 3D 9750 pci
Are you absolutely sure you're running in 16bpp? You shouldn't
run out of colors in that case?
What does xdpyinfo say?