Top Main Menu Disappeared

Hi, over the weekend the main menu for my site disappeared.

I do not know what caused it – I think I have updates to auto install so don’t know if something updated at the same time.

I have disabled the max mega menu and enabled again, but site still looked the same throughout.

Any ideas? Is it a problem with the plugin or the theme?

Cheers

The page I need help with: [log in to see the link]