Why does my game keep crashing?

• GMod9 is really picky about video settings:
  • Immediately restart your game after changing any video settings
  • Do not change your video settings mid-game
  • Playing in fullscreen will crash your game when you hit ALT+TAB
  • Play in windowed mode and don't minimize the game
• The default versions of GMod 9.0.4 b and c are really unstable nowadays
  • Download and install the fixed repack