Video works in Post Edit, but doesn't work on the site

After much trying, I finally got video to work... almost.
Editing the post http://www.sia.atl-3d.com/wp-admin/post.php?post=16&action=edit shows and can play the video.

But if you go to the post http://www.sia.atl-3d.com/2016/01/07/sk2016/ the video doesn't work.

I'm using an MP4 from my Media, and have the text protected in a read-more area (which is protected by Membership2)

I tried to add CSS/JS styling/themeing using the Scripts-n-Styles plugin, but I don't know why the video won't load, so I haven't bothered to see what works/doesn't.

If you guys have another recomendation for video, I'm all ears; I've tried
Easy Video Player, Huge IT Video Player, MediaElement.js, Videojs HTML5 Player [still active], Video Player Ultimate [still active], and WP Video...