For whatever reason when my clients use a windows computer and save a page that has embedded videos on them the videos will not show up on the page.
To fix it I just log in from my Mac and resave the page and it fixes it. I don’t change the elements at all.
This has happened with multiple clients on multiple sites with multiple browsers so I am fairly certain it’s a windows issue. It doesn’t seem to be based on what browser they are using. I had them try Chrome, Firefox, and Edge on their PC’s.
On my MAC it works fine on all browsers.
Currently Running X Theme Version 5.1.1 and Cornerstone Version 2.0.6. I found the changes you made after 5.1.1 made it more complicated to edit pages than the previous versions.