Over the past couple of weeks I have had two customers successfully check out via a PayPal processed transaction and not have their orders post back to Zen Cart. Searching for the customer in PayPal via their email address does show the transaction and transaction total -- but as there is no order in Zen Cart I cannot pull up the order contents.

I am, of course, concerned that there are more than two customers out there who have paid without having their order post.

Help?