Upfront won't load - starts and then just keeps trying to load and load and load

The main site uses Scribe as the child theme and obviously, Upfront as the theme. I cannot edit in Upfront. I can progress through the first stage. I then click on Pots/Pages/Comments and select the page I want to edit. From then on, the 'Loading/edit/etc' just keeps spinning indefinitely. '

The URL in the example I am looking at right now is http://whs.services/edit/post/1119

I have tried all pages/posts with the same result. The only way out then is to kill that window.

I am giving you access so that you can resolve this very frustrating issue.

David Wilks