Hello, I have this bug with your theme:

When I enable video background in the Row Settings and i embed a video the row gives me a blank white page of death on mobile/tablet view. 

This happens on the 2nd row of my website https://puravidasailing.gr (I try to recreate the row in revolution slider on the 1st row, but with no luck)

I added your suggestion in the htaccess.

I believe the problem is when your theme checks for the user agent.

Thank you in advance