Video playback problems in iTunes 10.5.2/3

Hi,
I'm running iTunes 10.5.3 on my MacBook Pro, Mac OS X Lion 10.7.2, 2,66 Ghz, Intel i7, and I have some issues with my video playback.
None of my movies/videos in iTunes will play. It's actually really annoying. I was having this problem already on iTunes 10.5.2. So today I tried reinstalling iTunes completely, due to the new version that came out, but I still have the problem. Any thoughts on the matter?
Thanks in advance!

I can't be the only one with this issue. It affects both my iTunes on my mac mini and my iBook

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Message was edited by: megumiii

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