I use a resolution above 10x7 (imagine that :
) using HDMI and I have been seeing issues when watching flash or silverlight full screen. The output enlarges the image too much and only shows the upper left quarter of the video. I didn't think it was a driver problem, but I had no idea what it was. This only started a few weeks ago and I hadn't installed any software prior.
Anyway, this new driver did not fix the problem.
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I solved the problem by turning off "Aero." I can't explain what prompted me to turn it off or why turning it off works.
Since moving to Vista I have stopped asking "why," now I ask only "how do I fix the latest problem."