When using presenter display, my videos are jumpy. Why?

Hello: I just upgraded to Keynote 3 and am having a nightmare. I use the Presenter display mode so I can see the next slide, (no mirroring) and use a lot of Quicktime video clips in my engagements. In Mirroring mode they run smoothly. In the presenter display mode they stop every second for half a second - making the video extrememely irritating to watch. It worked perfectly in Keynote 2. It 's not the projector - I've tried it on seven projectors that I used prior to Keynote 3 and it happens on all of them. I've tried using different resolutions, different refresh rate modes, etc. Nothing make it work right.
I do 100 speaking engagements a year. HELP! Don't make me go back to PowerPoint!

I have been having the same problem both in KN2 and in KN3. I am a speaker as well and I use about 25 QT videos in my keynote presentation. When I go back and view the QT files outside KN I still have jumpy, choppy parts of my videos. The weird part is that the the videos are choppy at different sections and then they will be fine for a week. I am stumped and from what I see so is Apple. Apple has replaced 2 logic board and I have spent hours on the phone with tech support and still no idea. All I know if about 15,000 people have seen the apple at the front and seen the choppy video and as you can guess all the PC guys always mention how choppy the video was. Not good promo for Apple.
I am interested to see if anyone has any answers to this.
Thanks
Brett

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