Okay, here is what is suppose to happen (and has in the past, unless PayPal has changed something). In payment.tmpl there is a line that reads:
Code:
Content visible to verified customers only.
This is the return URL, but from what it looks like PayPal isn't passing back the action and ad paramteres and just calling it plain. I need to look to see if PayPal has changed anything, but the return variabled used to call our script with the variables $action and $ad so we could complete the ad.