Nimble Builder functionality disappeared

Hello,
When I open the Nimble-Builder (Design -> Customizer) the page does not load properly. The “PRO” features of hueman are no longer displayed (header-design -> PRO header etc.).
You can’t create placeholders anymore and ContentPicker is not shown in the menu anymore. What happened there?
I have disabled several new plugins to limit the problem. But without success. Can anyone help me ?

Thanks a lot!

Translated with http://www.DeepL.com/Translator (free version)

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