Thanks Rob. You pointed me in the right direction. The uncompressed file was over 2 gigs. When I played it on a computer with more throughput there was no problem with the synch.
As I mentioned, I was rendering this 10 minute video uncompressed in order to archive it and then clear my internal hard drive of all the files in the project media. I intend to include this 10 minute piece with three others when completed onto a DVD, so I wanted the best possible version available. Does this seem like the best way to archive this or is there another format or method you would recommend?
Thanks again.