Please try to set logging to \"on\"in file YourStoreRoot/modules/agilepaypal/agilepaypal.php
define(\'Agile_Logging\', \'on\');
Then try to do the same test, there will be IPN data logged into file debug.log under the module folder.
If you can not see the IPN data in the debug.log file, it means there is connection issue between your server and Paypal server.
Let me know the result.