[Freckles]

I'm not sure but when I first got CS5 I had very wonky looking images, no matter what type I opened. I figured out that CS5 has some new 3D features that are automaticly switched on in preferences (it's called Enable Open GLDrawing, under Preferences/performance) My images looked fine when I disabled that. After a bit of research I discovered I needed to upgrade the drivers of my video card, and then I could use CS5 with that 3d mode turned on. Your problem is not the same, but maybe you can try switching off that OpenGLDrawing mode and see if your problem still exists. If it doesn't, then you might need to update your video card too.