I have the same type of issue. When a customer uses Paypal they used to get a receipt from the store and from paypal. Now they just get a receipt from paypal. Same goes for the store owner. I have Payments Pro installed with express checkout, the latest version of zen cart, all my settings have been double checked, I've used the IP test and my site is in debug mode. The curl files say success at the bottom. I don't understand. Please help!