Prior to AD 8.2, I could get around the pixellation (artifacts?) by either maximising the display or by turning on software emulation. Those options disappeared with 8.2. Coincidentally (or maybe not) my system started screwing up the text in my browser and a few other Windows programs.
Replacing the ATI card with a BFG NVidia GeForce 6800 GT OC card resolved all those problems, but now drawing windows are all messed up. Looks like other people have had similar problems with NVidia cards, so I'll be looking to see what can be done about that.
This is getting pretty frustrating.
Mike