Hello,
I’m using the latest version of the Enfold theme (3.4.7) as of January 2016 on a WordPress 4.4 build on GoDaddy. (Not sure whether it’s Managed WordPress or a regular Web Hosting service, at the moment.)
For certain pages, the Avia Site Builder will never load the editor. All it does is show the loading animation.
Furthermore, after failing to load the editor, the site appears to lock up, displaying a “ERR_EMPTY_RESPONSE” message. After waiting for a minute, the site is available again.