I bought an HD5670 a few weeks back. And just noticed something odd when I watch TV through Media Centre or play DVDs.
The image has a kind of pastel look, almost solarised (I think that's the effect), with large areas of colour being the same and very little definition/subtlety.
I previously had an nvidia 8500GT, and everything was fine, video-wise with that. The 5670 seems fine with graphics in games, and on windows in general but while watching videos it just seems odd.
I uninstalled the reinstalled the k lite codec pack that I've always had on my PC, but that seems to have made no difference.
ps I have the same 22" samsung 1050 monitor connected via DVI. It says screen is 32bpp and 1680 x 1050, which I sure is the same as I had it before!