I have deactivated all the plug-ins except for Newsletter and when I go to add a custom html form in Subscribers, Forms, HTML Forms, when I save it I get a 404 error on the following URL it tries to bring up and the custom form is never saved: https://mysamplesite.net/wp-admin/admin.php?page=newsletter_subscription_forms
Has anyone else had this issue and resolved it?
Thank you
Hi, this is rather weird, since we use ajax to save those forms, so the “landing” page is actually the same page where you edit the forms. Just to be sure: the 404 appears right after you click save at the end of the page?