it's strange... if I check the checkbox... and remove the http:// and save... it says IPN activated.. and On. But if I go back and edit again I see the checkbox unchecked... and the http:// again there...

doesn't work either IPN activated or not...

the return url in the paypal page after payment is
name="merchant_return" action="http://www.xxxxxxx.com/en/uc_paypal/wps/complete/20"