Ubercart/PayPal Standard

Howdy,

Hope someone can help me out with what should be a simple task: Using Ubercart with PayPal Website Payments Standard. When the user completes the order, they should go to an order confirmation page and receive a confirmation e-mail. However, neither is happening. I believe the issue lies with using the correct 'Return URL' in my PayPal Website Payment Preferences.

I've tried http://www.example.com/cart/checkout/complete (with my own domain name of course), with no success. Any suggestions?

Thank you!