Renderer bugs up if you alter the display resolution after setting "vid_renderer" to 1
1. Start ST with the software renderer enabled.
2. "vid_renderer 1" in the console.
3. Start a new game.
4. Alter your display resolution in "Options -> Set Video Mode".
I'm unable to reproduce the issue in GZDoom 323, but I'm able to reproduce it in GZDoom SVN build 1215.
Spoiler: The visual glitch
Windows 7 Home Premium 64-bit
Intel Pentium Dual-Core CPU T4400 @ 2.20GHz
4,00 GB RAM
ATI Mobility Radeon HD 4500 Series (8.634.1.0)