Avia lay-out builder not working anymore since WP4.0 upgrade

Hi,

I’m using the enfold theme on multiple sites and on at least two of them the avia layout builder is broken(not loading the builder, not being able to switch back to standard builder).

I found similar threads about this problem, but none of them seems to have solved the problem.

What I’ve tried to fix the problem:

· Allocating more memory to PHP
· Setting the avia layout builder in debug mode to see what happend. Nothing showed up.
· Deactivating plugins also didn’t worked.

I really dont want to reinstall the theme. So please think with me to fix this problem.

Thanks in advance