Surprisingly the first video I listed in my most recent post here appeared in its location at my site's home page and it played back well. I created or opened a duplicate of the page on a new browser tab, but the page duplicate did not display the video.
I have taken screen snapshots of the two pages and uploaded them in my WordPress media library for your comparison. Here they are:
- GOOD page: http://contemplatingtruth.files.wordpress.com/2013/01/choirboys-video.jpg?w=1350
- BAD page: http://contemplatingtruth.files.wordpress.com/2013/01/choirboys-video-display-problem.jpg?w=1350
Hope this helps your troubleshooting. Let me know please. Thank you.