I'm not sure where to send this bug report so I thought I'd send it to you as a PM (hope you don't mind, although if you do then please accept my apologies.) I'm running GZDoom with the -nojoy command and I get a really fatal crash after about 5 minutes of playing. I get a lot of green dots appear on the screen and the game completely locks. When I press CTR+ALT+DEL I eventually get a bad quality task manager screen but then it hangs again and the only way to resolve this is to do a hard reset.
This also happens in windowed mode (I figured that if it happened in windowed mode I could easily close the app... but it still locks up Windows with the crash!)
Zdoom works fine, but I currently can't play GZDoom because of this. My suspicion is pointing to some form of video card conflict (I'm using an Nvidia Gforce 8800 GT with 512 megs of ram.)
