Hello I have the same problem
My config is :
Jupiter version 5.5
I have bought WPBakery plugin so my version is 6.1 (last one today)
Updating my WPBakery plugin content of my pages are not displayed and I can see the same youtube video in background of each component (https://www.youtube.com/watch?v=lMJXxhRFO1k)
I have try to solve it by uninstalling plugins, and install it again from Jupiter or manually directly and the result is the same : no content displayed
When I uninstall WPBakery plugin I can see my pages in html format with mk… tag but not interpreted.
When installing again WPBakery plugin it disappears.
Do you have any solution for this problem ?
Why this youtube video is displayed ?
Thx for your help