I am having the same problem. Any pre-built page after I updated to 2.53 O can no longer be accessed or seen in the WordPress editor, as well as the Swift page builder does not function, it take out all code.
Essentially I cannot access a single page on my site to edit… well any and all content.
I am in need of some major help here, I would like to get this site completed and I do not want to build each page again.
Your help is greatly appreciated and needed.
Thanks,
Justin