Please I need help here as well urgently, I am experiencing the same problem:
Advanced Layout Editor it’s blank. I can see the default editor OK, but the advanced layout editor gives me a spinning circle in the content box and then nothing.

Which means I can’t work on my website and it is only half done and live.
I am using Enfold version 2.7 and the site just updated to WP 4.
Website is http://www.creativethinking.dk
Thanks