Hello, I would like to add, after deactivating Contact Form 7 plugin and then making a few changes to the home page I encountered the same issue again where page builder fails to load in the text editor and only shows html text. I deactivated All in One SEO Pack for WordPress and now it seems to be working again and I can update the site home page in page builder mode. This seems to be an issue with the latest update to Page Builder/Site Origins Widget.
PS I cannot comment on the previous post so I started a new thread. See last post. Thanks.