We are using CE18.104.22.168 with all patches installed. We offer Paypal express checkout as a form of payment. Customers who are paying with paypal are not receiving the Magento order confirmation after completing payment and their order. We have checked our settings and they appear to be correct. We are receiving the payment IPN and the payment, and the order is showing as processing. The problem is only with paypal payments, customers using a credit card are no problem.