How large is the video file included in the troublesome article? Also, I'm inferring from your reply that the unpublished folio downloads without error, correct? The reason I ask is I'm wondering if you tried to unpublish and then publish again. That would have been my first suggestion to try and resolve the problem, but perhaps you tried this already.
I'm also curious if others in this thread are experiencing the problem with large articles..
You may need to contact support on this one so they can dig into the characteristics of the troublesome article.