I just purchased a new computer which is running Windows 7 and has an AMD Radeon graphics card. I loaded my Photoshop CS4 on this new computer. I previously had CS4 loaded on a Dell Inspirion laptop that died. I never had any problems with CS4 on my laptop. However now I am having a weird issue. I have always used a working color profile of sRGB IEC61966-2.1 as that is the color profile that my digital camera uses. Now when I open photos in CS4 using this color profile, there are black pixelated areas on many of the photos. I can get rid of this in two ways, 1. by dropping the saturation down to around -8 or 2. changing my working space profile to Adobe RGB 1998 and then converting the documents color profile to the working space. This option is really annoying as I have to convert every photo that I bring in to Photoshop. Does anyone have any idea why this is happening? Is there some setting I am missing somewhere? Is the graphics card not compatable with CS4? Any help would be sincerely appreciated.
Problem is very likely to be that your AMD graphics driver has a well-known bug. See the post marked correct in thread: Image not displaying correctly Photoshop CS5 Extended V 12.1. (Same file OK in PS Elements)