I’m frustrated

YouTube Videos - some play and some don't?

I have three YouTube videos in a presentation. Two of them play fine; here are their IDs:


The 3rd one skips part of the video upon playback, starts halfway through the video, etc.; here is its ID:


All three were encoded as quicktime at same bitrate and uploaded to YouTube at 1120X630 res. The placeholder and presentation are both set up at 1200X800 so I could test on a laptop I have. I have some quirks from some of my other YouTube videos as well.

Any reason why some work and others don't? I haven't saved them to dropbox or any of the other suggestions.
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