I downloaded Gametracker and went to play Garry's Mod so I could track my hours on a server, then when I went to actually play the game, every single time I open the game it closes about 5 seconds later. It only happens when I have Gametracker running.

Anyone know how to fix this?

Hello,

The crashing problem could be related to the GT Lite in-game service. You could try disabling in-game services for Gmod.

In-game services are located on the Game Setup tab of the Settings window. "Edit" Gmod and uncheck the several in-game options. Note that this requires a game restart.

Should this solve the issue, it is likely related to GT Lite. If you'd be able to provide additional information in that case, you can log a task for it. http://www.gametracker.com/downloads/bugsubmit.php