Remove any launch options currently shown. Right-click the game which needs to be reconfigured The -autoconfig launch option will allow Steam to configure Garry's Mod with the best settings for use on your machine. Press 'Verify Integrity Of Game Cache' button Select 'Properties' from the dropdown menu Sometimes game files might get corrupted and a file verification is neccessary. If your Garry's mod crashes while joining a server, I have some tips how to fix it.
Garry's mod crashes when loading in server?
