Yesssss!!!!!!!!!!!!! I have got the solution!!!

I have tested the following browsers and found out that only Chrome shows the error message! Seems that Chrome has a bug here.

Crome 5.0 Error
Firefox 3.6 OK
IE 8.0, 7.0 OK
Safari 4.0 OK
iPhone/Safari OK


I am actually a little bit surprised that no one else seems to have spotted this bug. Could anyone of you shorty test your PayPal IPN integration with Chrome and let us know whether you are experiencing the same problems?