Some files and images I open in the Photoshop window look pixelated or choppy, but when I open in Acrobat or viewer they look fine. This just started about two weeks ago. I reset my settings, and all of the the help topics come up for blurry images/re-sizing. I have had this problem with .tiff, jpg, and pdf files.
Photoshop CS6 Ver.13.0.1x64
Windows 7 Professional Intel(R) Core(TM) i5-3340M CPU @ 2.70GHz
AMD (ATI) FirePro M6000 (FireGL V) Mobility Pro Graphics
That black degradation in the background at the top looks like an old ATI driver bug where if for a given pixel the red channel reaches zero all three colors of the pixel would go black. I think that was a couple of years ago we were seeing that.
See if AMD has released newer drivers for your FirePro card.
Thank you Noel! This worked perfectly. I should have checked that first, but I was over thinking the problem!
Have a wonderful week!