Alternate display and mp4 files

Hi,
I regularly use my MacBook (OS X Leopard) in a large lecture hall with a ceiling-mounted projector. The presentations have often been prepared on my iMac G5 with Tiger, but that's no problem. I use "alternate display to view presenter information." Last week, I inserted some mp4 files into some empty slides in my sequence...it worked brilliantly at home (the files started up automatically, played, and then finished, at which point I just hit my right arrow key, which took me to my next text slide). When I went to class and hooked up the MacBook to the projector, everything was fine until I hit the key to advance to a slide with an embedded mp4. The Keynote window was immediately gone and I was left with a view of my desktop...nothing happened. Interestingly enough, Keynote had not quit. Its icon had a miniature green "play" button on it (as you would expect on a CD player, etc.). The only way for me to salvage the presentation -- as class was about to start -- was to run the presentation with display mirroring. I lost the opportunity to have my presenter notes, but advancing to and past the slides with mp4 video clips was no problem at all.
Does anyone know what happened here and how I might go about troubleshooting? Did I do something that the projector could not handle? Are there resolution settings for both displays that I should pay attention to here? As previously mentioned, I've never had a problem with alternate display and presenter notes in this hall or with any other projector on campus; that's why I assume that the mp4s were part of the problem.
Much obliged for any help whatsoever,
Hank

Check Keynote Preferences > General and be sure the box "Copy audio and movies into document" is checked. Other than that, I have no suggestions.
Good luck.

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