Green screen and video freezing while maximizing videos playing in iTunes?

After a year-and-a-half of seamless operation, iTunes started malfunctioning yesterday. When trying to play a video (either a TV show or a music video), the video will often freeze when I hit command-F to maximize. The audio keeps playing just fine. Sometimes I'm able to get the video running again by hitting escape and command-F a few times, and by hitting space bar repeatedly to pause and unpause. Before starting to work, iTunes displays a green screen for a half-second.
My system is at 10.5.8 and my iTunes is fully updated. My computer is an aluminum-unibody MacBook Pro 15".
I have tried turning the computer off for a while, reinstalling iTunes, and switching from discrete graphics to integrated graphics, all without any improvement. I doesn't happen every time I play a video or a TV show, but it does happen a majority of the time, and it often takes 10-20 seconds of fiddling to get the video to play.
Any ideas? I'm stumped.

I've been having the same problem as you Mitlov. This is one of the reasons I always get a bit leery about updating my current version of iTunes, iPhone, or iPod. Something always stops working amongst one or more of them. Two years ago I updated iPod and I remember it took a month before I could get the iPod to work again. If you hear about a fix for this problem (besides just buying Snow Leopard) please post it back in the discussions. There are a lot of people who will benefit from it!

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