Resolution bug in GZDOOM and Skulltag

[Mystery Man in 3D]

This only happens on half the computers I play GZDOOM and Skulltag on, but it's a very irritating bug:

Whenever I play these source ports in OpenGL mode on any resolution below the computer's native resolution (which I like to do, because lower resolutions obviously mean better performance), this happens:

http://imageshack.us/photo/my-images/69/stupidbug.png/

I press ALT+ENTER to go into Window mode and back to Fullscreen, but it still won't display the right way. No offense, but I'm getting really pissed about this.

Is there any way to fix this problem permanently?

[Kore]

I have the same problem, I couldn't fix it permanently but I open the console and type:
fullscreen 0
fullscreen 1

Also
http://i.imgur.com/10Bfr.png
I can pick any of those two resolutions, and when I do the resolution changes to 0x0.

[Planky]

Isnt that a graphics driver bug that isn't reporting the capable resolutions properly?

[Gez]

Mystery Man in 3D said:

Is there any way to fix this problem permanently?

Works for me with GZDoom r1238.

However, Kore's problem does happen.

[Kappes Buur]

I have always been using computers equipped with an NVIDIA graphics adapter, and never had a problem such as this.

If you are using an ATI graphics adapter, it is a known fact that some driver versions refuse to work properly.
http://zdoom.org/wiki/GZDoom#GZDoom_and_ATI shows which driver works or not.