Playback is jerking

I have been working on an imovie project for the past few weeks. I have divided it into several segments. It is a slide show with lots of Ken Burns segments set to music. I have been using the 720 HD setting.
Everything was fine until late last week. I noticed that the playback was not smooth, a slight jerking was noticable in all of the movement in all of the movie segments. I also had some problems with sound stuttering. I have noticed this problem in the past but it would go away after I would save the project. Saving the project doesn't help now. I can export the movies to a Mac Book Pro and everything plays just fine.
I don't remember changing any of the settings in imovie or on the system. I am not sure if there were any system updates that I might have made recently but something is very different.
I have tried putting the com.apple.imovie.plist in the garbage but that didn't help. The first time I did it, I got a message while opening imovie saying that my machine did not have an adequate video card for the Ken Burns effect.
The warning message has stopped and I can't remember what it said I needed. I have a G5 with 1.6 Ghz / GeForce Fx 5200 AGP video card / 2 GB memory / OS 10.4.10 and iMovie HD 6.0.3.
Before I go out and buy a new video card, can anyone tell me how to get my machine to do what it was doing a week ago with the existing video card?

Hi Karl,
I read the information from Apple about the cards that support Quartz Extreme. The example that they show is the same video card as the one in my G5. When I look at the Graphics / Display information in the "About the Mac" it says that the machine does support Core Image and Quartz Extreme. It is a mystery as to why I was getting the message telling me that it wasn't supported. Try as I might, I can't get it to display that message now.
It sounds like part of the problem is that I am working the video card beyond what it is capable of??? Do you think that a video card with more memory would allow the movies to play smoothly?
The mystery to me is why was I able to play them smoothly for several weeks and not now? Movie segments that I had finished and have not been working on played just fine several weeks ago. Now they are all jerking when I play them and the sound will stutter at times. Again, the same movie will play just fine on the laptop.
Dan

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Hi Dave,
(San Diego, CA? early morning,hm? nice, we got snow
whole day......)
ok, and you tried with another movie from same
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Hi Dave,
(San Diego, CA? early morning,hm? nice, we got snow
whole day......)
ok, and you tried with another movie from same
camcorder? (I recommend the usage of dvd-rw for test
purposes....) you don't add any "non camera clips"?
and project is on local disk? you didn't
"partitioned" your drive?
you've read this article?
http://docs.info.apple.com/article.html?artnum=61603
finally: camera is attached "directly", no fw-hub
inbetween? no chaining with other devices...?
sorry for so many Qs, but many reasons........ :-/
Well it is 14 C here!.

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