I wanted to add the fact that I have three displayes at 6048 x 1080 @ 60 Hz and think this may be the issue. I have not changed this previous to the new iTunes11. This is what I have had it at for over a year and am just now having the issue with not being able to view my movies in HD. I honestly do not know if this is the problem but it does nothing to disable Eyefinity anyway.
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