Okay, so I went through the standard protocol for adding Call of Duty 4 Multiplayer to GT Lite (went through the games settings and manually added it myself). When I ask it to open the game, an alert comes up saying that Steam needs to be running to access the game when Steam is obviously running. Steam is even open and not minimized.

I'm on a Mac, if that helps at all. I just bought CoD4 over Steam during the sale to play with my friend, and it kind of upsets me that I paid $10 for a game that I can't even access the main functionality.

Thanks in advance for any help!

+1 Exactly the same for me.