WPF rendering on Vista is ugly and blurry

UPDATE: I discovered the problem. It was the NVidia drivers for my 8600 GT. Previous drivers were 78.13 (7813). New drivers are 82.50 (8250). Running Vista x64 with .NET 3.5 SP1

On my Vista machine, WPF rendering is nasty. I don't know what the engine is doing. My DPI setting is default (96 DPI). Aero is turned on.


On Vista, witness the nastiness:




On XP, the kind of quality we've come to expect:





I can't puzzle it out. Incredibly odd that I can't find any mention of this on the WWW.