alexadm on "[Plugin: iThemes Security (formerly Better WP Security)] Plugin breaks /wp-admin/admin-ajax.php"

Whenever I activate iThemes Security, all backend calls to /wp-admin/admin-ajax.php retu a 500 error. Which breaks "Import media" in a Post, one-click update of other extensions and pretty much any backend action...

https://wordpress.org/plugins/better-wp-security/