Menus not showing in admin area anymore and Woocommerce attributes disappeared

Hey there,

Today (eventhough I did not change anything in the last week) the attributes of my products in woocommerce did not show up anymore. The label of the attribute is still displayed on the front end but the data of the attribute not. And in the backend (when I edit a product) it only shows 1 or 2 attribues.

Also when I'm logged in as admin and go to appearance -> menus there is nothing displayed anymore. It just shows the field to creat a new menu but not my still existing menus. I have 3 different menus in use and on the website they are still displayed but not in the backend.
When I creat a new menu nothing happens. But I see that the new menu is added to the database...

Please help!!!