We use SP Page Builder to format Joomla content and we also use the SP Page Builder module in key locations on our site.
I upgraded to 3.7.14 this morning and now when I click on an article none of the SP Page Builder content is showing in the backend. The problem is the same for Joomla content and modules.
I can reveal content if I click 'Joomla Editor', but this is not the content we use.
In the front end the content is showing fine.
We are running PHP 7.4, and for now I have turned off all caches and cloudflare.
NB installed Sp Page Builder twice - as recommended here: https://www.joomshaper.com/documentation/sp-page-builder/sp-page-builder-3/installation