Thanks,
I tried removing the preloader on the video and uploading it in both
environments, but wasn't successful either time.
It DID load the first time when I inserted it as an mp4 and published to
html 5 only, but it made several of my buttons disappear, even though they
showed up fine in the html preview. I tried publishing it to a swf file,
and then the video didn't load at all.
Ideally I'd like a solution that could just work on Captivate 5.5 to save
me the trouble of upgrading the software and redoing all of these modules.