Using PayPal Standard.
I have a donation form that does not return to the confirmation message page after a successful PayPal donate transaction. If i set the the PayPal form to be a Products and Services it works fine.
The donation transaction is recorded in PayPal and GF properly, but the process brings the user back the form page with the following querystring (that appears to be the contents of the IPN response from PayPal):
I have the PayPal settings on test server and I am using W3 Total Cache, but I got the same results with all the caching turned off too.