Does it just dump you back to the desktop? There's something about this in
the readme, I think. I'm going from memory here and it was several months
ago, but I believe the readme mentions that you had to delete the gpl.ini or
gpl.cfg file and restart. For what it's worth, I ran the GPL demo (both
Monza and Watkins Glen) on a P5-233MMX w/ Guillemot Phoenix PCI, so it will
run on a Banshee.
There are several different demo versions floating around, so that may be
causing problems. I had problems with one of the Monza demos that
disappeared when I downloaded a different version.