Ok, here's the problem, every steam game I have, Counter Strike 1.6, Counter Strike Source, Half Life Source, and Half Life Death Match Source have a mouse problem. My mouse works perfectly fine before I run these games. Once I run these, the mouse cursor dissapear, but the game itself has no problem, I can access all the other feature/options that are accessible with a keyboard. When I exit the games, my mouse works like normal. Anyone got any solution to this?
I have a G5 and play Steam games and have not run across this. I assume you thought of this, but did you re-download and install the driver? I think there is also a firmware update for the G5. I'm not sure if it would solve your issue though.