Purchase has been refunded and you should receive an email confirmation about this.
Did you change anything on the site? When I tried to checkout using paypal earlier the paypal window popped up but never connected to paypal but opened in the checkout_failure.php page immediately. I just tried it after I got your message and it worked.
What has changed? I hope you did something so I can understand what I did incorrectly before.
But thanks so much.