as anyone else had a problem with the Gamma slider not working since the 10.5.3 update of Leopard. everything else is good but for some reason the Gamma slider moves but doesn't actually change anything, and some of the missions are really dark. I'm running 10.5.3, 17" iMac 1.83 GHZ Intel Dual Core, 1.5 Memory, ATI x1600 I think. Thanks