Recently I've been messing with my cfg yet again and I wanted to try to play on a higher resolution than usual. I've been playing on 800x600 since few years, so yesterday I switched to 1024x768 just to try it and check how the game runs. My cfg is using LightMap, and I noticed that my Q3 looks quite weird in fullscreen - ceretainly not how it is suppose to look. However in window mode everything is ok. So WTF?

Comparison (using exactly the same cfg)
-Q3 1024x768 windows mode (proper look)
-Q3 1024x768 fullscreen mode (fucked up look)

Any help appreciated.

And this didn't occur on 800x600 - fullscreen and window mode looks the very same way (just like on the first screen).