Hi,
Thanks for looking into it. Your provided beta (v2.2.3) solved the issue! Thanks a lot. Just out of curiosity, what do you think was the cause? I don’t know why or how it started, but at any given moment the sign-up sheets plugin was enabled, access to admin-ajax.php was restricted to (logged in) admin users only. I’ve verified the issue on multiple devices with different browsers and all came up with the same result. The other plugin (EventOn) was depending on the php file to load the agenda items using Ajax.
Thanks a lot for helping out!
Kindest regards,
Mark