I have been validated, I guess, because I automatically get the Theme updates in X.
I have the current version 6.0.4...see jpeg immediately below, not an older version.
I used Cornerstone last week, but this weekend there was a Cornerstone update that I ran and an X theme update that I ran.
When we experienced the problem, I replaced my site with a backup, and it displays correctly, but I can't edit any pages that have been created in Cornerstone.
When I click Cornerstone from the "X" submenu OR the "Edit with Cornerstone" link on the individual page/post edit page, it begins to load, but stays with a spinning circle over and over and never loads.
I have hit the check now button several times to see if there is an update available in my Validation page, but it says there is "nothing to report".
Thanks for any help!
NEW DEVELOPMENT - I've tried to open it in Chrome -- no dice, MS Edge -- no dice...just tried Mozilla..opened right up. Both from the "X" submenu within WP and from the link that comes up when you mouseover the page link from the WP "Pages" list.