I have a 24inch iMac (Nvidia GT 120 256MB). SL since release - NO graphic issues or freezes. Not one on a machine that runs mostly 24/7 Lion - graphics issues, crashes, freezes 5 times a week. Crash, freeze, have to reboot. I waited to install 10.7.2 fresh so it's a fine running system. I've noticed if i run apps in full screen, the system crashes quicker (presumiby overheating the graphics card) Result? This is a Lion issue. Apple, fix this! Sometimes crash reports are available - i've emailed them all to Apple. Roll on 10.7.3. The error reports look like it's the driver. Anyone else having this problem?