X thinks my screen is larger than it actually is

[Marcus Claren <marcus.claren@mbox301.swipnet.se>]

Hi!
I've got a very annoying problem. My X server seems to
think that my screen is bigger than it actually is.
I'm using wmaker, and when a program window drops out
of the desktop I can usually maximize it and make it
fit the desktop perfectly. So wmaker knows the size
of my screen, I think. But when I'm running certain
programs, like games (Xsoldier, Xworm) which seem
to have a preset window - size their windowborders
are vanishing outside the desktoparea and there's
no way for me to resize them. Other programs that I'm
experiencing the same with are Rosegarden, a music program
and Blender.

Some guy at irc told me that this could be due to
that I've set my virtual res too high in the XF86Config-
file, but he couldn't explain to me exactly how to 
change this.

Anyway, please help me as this makes working with
some programs impossible.

TIA
//Marcus