Video playback locks up iMac

Using iTunes 9.0.2. Starting this week, it locks up the iMac G5 (cannot escape the frozen image in any way other than the power button) most of the time I play videos. It's happened with movies I've ripped using Handbrake and files I bought from the iTunes store. The files do not cause problems when I open and play them from QuickTime Player. So far I've had no problems with video on the MacBook.
I recently upgraded the hard drives and RAM on both these machines. I doubt (or rather hope) that's not the problem.
Any thoughts or suggestions on fixing this problem?
Thanks.

You already noticed that the minimum requirements for iTunes video is a 1 GHz G4 or better.

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