The other entry did not match this issue, so I’m posting our issue here. When I try to edit a password protected page with Cornerstone, I get an error screen that reads:
The Preview could not load due to the iframe response being incomplete. This is most often related to a plugin conflict, or customizations introducing a PHP error.
Origin URL: https://lydiareedpiano.com
Preview URL: https://lydiareedpiano.com/members-only/
Try again
Cornerstone works fine on the other pages, though. And if I deactivate U.M., cornerstone will edit that page fine. I posted this on the Ultimate Member forum, but they did not come up with a solution.
Any ideas?
Thanks,
Roger