It was just spinning and now if I load a page to edit, it is just a black screen: not even the side navigation.
I had gotton an error that I now forget the wording to but when I looked at your documentation it was described as the most general so I followed the recommendations:
Update the php to 7.2
Turned off all plugins but Cornerstone
Nothing happened except we went black. This is a staging site and a lot of plugins have been eliminated. And when I select a page to edit from the external menu, it shows on the page until I try to edit it and then it disappears, and there is no content. At this point I have been able to open Cornerstone and edit fresh. I do not see what can be causing this. Can you look at it for me. Thank you. I will add info in a secure note.