[STUMP] Fullscreen apps not working

[cothrige]

I am having trouble with certain fullscreen apps on stumpwm.  If I use
mplayer in fullscreen it is fine, but if I play doom or any game that uses
a fullscreen mode it isn't.  Instead I get what looks like a corner of a
window jutting into the screen, covering up a large portion of it.  I can
sometimes work around this by splitting the frame in some way (hsplit,
vsplit) before starting the game, but often this just makes the offending
window block a different part of the screen.

Any ideas of what may cause something like this, or what may be able to
fix it?  BTW, in the past I have noticed this behaviour with several versions
obtained via git, both with sbcl and clisp.  I also just installed the 0.9.0
version via stumpwm website also with both sbcl and clisp and have had
the same result.

Many thanks,

Patrick