I was able to update the breadcrumb templates on our development and staging servers, but when I try to save the new settings (just an extra CSS class name) on our production server, I get a Wordpress 404 error page.
I have tried saving in each of the different tabs, but I always get the 404 error from any of the settings tabs. Yet, if I copy the url of the error page, with the "#post" or "#general" or whatever at the end of it, re-paste that into my address bar, and hit Enter, the settings page set to that tab loads fine, but with the old settings still in place.
We are running version 4.4 of the plugin. (We would rather not upgrade Wordpress or the plugin quite yet.)
I have check the Wordpress debug log, and the Apache and ModSecurity error logs, and there is nothing related to the plugin in them.
