The use of the admin-ajax.php file by our plugin is necessary for certain features to work. This includes loading more posts with the “Load More” button, image resizing, and adding comments in the lightbox. Here are some common reasons this isn’t working:
See our related FAQ for more info.
2) A security plugin or a custom rewrite rule in your .htaccess file is blocking access
Many security plugins have a setting to workaround this issue. The use of admin-ajax.php is the officially supported method for using AJAX with WordPress so many themes and plugins do this.
2) The WordPress Address or Site Address settings are not correct
These settings are found on the Settings -> General page in your dashboard. Make sure the protocol (http/https) matches what your site is using.