So I have CS4, and it's been wonderful on my new 24" iMac. After the latest 10.5.6 update, it started giving me this message every time I open Photoshop: Photoshop has encountered a problem with the display driver, and has temporarily disabled GPU enhancements. Check the video card manufacturer's website for latest software. GPU enhancements can be enabled in the Performance panel of Preferences. This never happened before 10.5.6. A coincidence? Or did something change? Why does it keep giving me this message?