Open GL screensaver crashes X

[Johnny Ljunggren]

I'm using a Matrox G450 on a freshly installed FCt3-system with no
updates (yet). Whenever the screensaver kicks in, and an Open GL-saver
is the next in line, X crashes.
What can be done about that? The system looks very unstable now.
Of course, I can turn off the screen saver, or maybe install the latest
drivers from matrox, but that doesn't solve the problem for the next
guy.

-- 
Johnny Ljunggren