Hi,
There is no response page after the transaction is successful through PayPal. This is the case with PayPal. I do have CCAvenue gateway and it works perfectly fine. A proper "Thank you" page is shown after successful transaction.
Page after PayPal- http://postimg.org/image/8hb57wxxz/
Page after CCAvenue- http://postimg.org/image/585t5wtmb/
Please let me know what to check for.
Thanks