AJAX Blocked
It is common for web hosts and system administrators to disable the built-in WordPress AJAX processing. Store Locator Plus requires AJAX to be enabled. This typically manifests itself with the AJAX call to the admin-ajax.php script not executing.
You can test this by directly surfing to the admin-ajax script on your server with a URL similar to this:
/wp-admin/admin-ajax.php?action=csl_ajax_onload&addressInput=&ignore_radius=1
This should return a JSON response showing curly braces that start with {“success”:true,…
If it comes back with nothing, or a warning/error about being blocked, your AJAX security is not set properly. Check you web server log files and talk to your system admin for assistance on configuring access to WordPress AJAX scripts.