@rjdougan, Can you please confirm that you are not getting anything in the Debug Log file (ipn_handle_debug.log)? If this is the case then that means something is blocking PayPal from sending the payment information to the plugin (the plugin won’t do anything unless it receives confirmed payment notification from PayPal).
Also, please post a link to the page where you are using it so I can have a look at the HTML and see if I see anything weird.