Garry's Mod 9, when I try to run the game, it shows the game for about half a second and closes. It's running in window and the window resoulution is 16:9
Try rebooting steam and joining gmod 9 servers through the server list on the steam interface rather than starting gmod 9 if that doesn't work let me know
could be does ur game still work at all now? if ur game doesn't work try reinstalling thats the only suggestion i can think of right now