The ajax calls should be handled by admin-ajax.php and can not be changed. This works when using security plugins but does not seem to work in your case. We had users for whom above solution had worked. This has hardly to do anyhing with our plugin settings rather a set up of your site.
You are using a different plugin so can you please check with their support team? I am sure they must be having some solution. Please post back here once you get this working.
Thanks