Video playback stops while audio goes on

After several month of not making any movies, I am trying a new project. Right of the start something is wrong, freshly imported unedited line of clips is not being played correctly in iMovie preview window - video stops in about 30sec or so, while audio goes on. If I switch to full screen, it gives me another 10sec of video, then it stops there, too, and nothing brings frozen video back to life. After restarting the app, everything repeats.
Needless to say it's impossible to edit.
It also does it with the older projects, which used to work just fine.
Here is what I've done so far:
1. Repaired permissions on startup disk and checked it for errors.
2. Repaired external disk, where the project resides (even tried to move the project to internal disk with no avail - same results), and where I have 80GB of free space.
3. Replaced external disk's directory, using DiskWarrior.
4. Deleted iMovie preferences file.
5. Removed all third-party plug-ins I had.
Nothing works.
QuickTime Player seems to play imported clips fine, so I am guessing, it's an iMovie bug. Any practical suggestions would be highly aprecciated (by practical I mean, not "reformat your hard drive and reinstall everything" or "buy a faster computer" or "invest in FinalCut instead")
I've been a loyal iLife user since the very beginning, and I swear, iMovie in it's buginnes is only challenged by iDVD.

It is a common problem for G4 800 machines and I've been told Apple is investigating the issue.
Try putting your Mac to "sleep" for a minute and then try the file again.

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