Movie stopped playing back smoothly

I'm working on a movie that is presently about 19 gigs, using a new eMac (G4) at my job site. Have the latest version of Tiger OS. Everything up to date for iMovie HD. Playback has worked perfectly until this afternoon. Now frames drop so badly that it looks like a series of stills instead of a film. The audio works perfectly. I have done a lot of audio work- extracting tracks and dropping them elsewhere. Other than that, nothing unusual. I've rebooted, taken out clips, tried all sorts of things to find the culprit but to no avail. Now I am worried that the work is lost. Would appreciate any help you can give.
Thanks

Mary, THANK YOU. Your solution did indeed help a lot. I had to boot up from my system disk to do the repair but there is a definite improvement. The movie now plays smooth enough for me to finish editing. It still drops frames but at least I get flow.
However, Apple, I would like to understand what causes this problem in the first place. It seems quite eccentric to have to repair permissions constantly when editing a film. And I am on a brand new eMac with very little on its hard drive other than the movie and some graphics applications that are closed when I edit. Here is the info on my machine:
Machine Name:     eMac
Machine Model:     PowerMac6,4
CPU Type:     PowerPC G4 (1.2)
Number Of CPUs:     1
CPU Speed:     1.42 GHz
L2 Cache (per CPU):     512 KB
Memory:     1 GB
Bus Speed:     167 MHz
Boot ROM Version:     4.9.2f1
I had planned to purchase a powerbook in the next few months but am now having second thoughts. Too expensive for something that needs constant tweeking unless I can find out what causes it. I know people who do not have this problem at all so what am I doing to cause it? C'mon, Apple, How about a tech note.

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