ITunes videos won't play after 10.8 upgrade--checkerboard pattern

On my Mac Mini (mid-2009) connected to an LG TV, after upgrading to Mountain Lion, all purchased videos on iTunes play audio but display a gray/white checkerboard pattern instead of a video. The same happens when I try to play the videos in Quicktime.
Someone else posted a similar problem here -- https://discussions.apple.com/message/19104312#19104312 -- but my problem doesn't seem to be the same (a conflict with Edovia's TouchPad app). I do, however, connect to this Mac Mini through Screen Sharing, and perhaps there's a VNC conflict going on. Just to be sure, I turned off another Edovia app, "Screens," on my iPad, but the issue remained.
iTunes will happily play non-iTunes-store videos. Also, I'm able to stream the iTunes Store videos from the Mac Mini to my MacBooks (running Mountain Lion and Lion) and iPad without any problems.
Thinking it was a DRM-related issue, I disassociated all devices and computers from my iTunes Store account and then reconnected them. No joy. I repaired disk permissions. No luck. Lots of restarting.
Has anybody else run into this? Possible solutions? It's driving me batty.

I am having this exact problem, however, it's only video content I download from iTunes. Anything that I've imported into iTunes, from alternate sources, will play just fine.
This seems to be a Quicktime problem as I have found that when you attempt to play iTunes files in Quicktime player, the same grey and white checkerboard pattern appears.
I am using my MacBook and MacMini in the exact same way. I am hoping there is an update to fix this probelm ASAP. This was my media center.

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ITunes videos won't play after 10.8 upgrade--checkerboard pattern

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