All setting menu's and layout builder gone

Hi,

I have been working to add content to my site every now and then without problems, and recently ‘restored’ an earlier publication of the home page. Since then, the live homepage is empty (according to the content in the restored page it was not empty). In addition, in the theme admin, the Avia layout builder doesn’t load at all. I searched on the forums and Google to find that I am not the only one with this problem, however the steps that were successful for many, they weren’t for me :(.

Also, the left menu in the Enfold settings menu (where you can change general settings, favicon, header footer etc) has vanished.

I am using Enfold 2.9.1 and WP 4.0.

I have tried the following:

– re-install WP –> no effect
– change theme, then change back theme –> no effect
– added the line “define(‘SCRIPT_DEBUG’, true);” to wp-config –> no effect
– renamed the plugins folder –> no effect
– de-activated and deleted all the plugins –> no effect
–
– throw stuff around in the office –> not the desired effect

Please help..