I've been running zen for several months and have not had any upgrades or changes/modifications in the past few weeks. Everything has worked fine until this morning.

I have customer orders not logging in Zen Cart. They place their order, pay with PayPal and then redirect back with nothing showing in their order history of their order they just made. However, PayPal shows the transaction for me. I cannot find their order in my orders area.

If I issue them a gift code and they pay this way, they are able to repurchase the items they bought so they can download them.

I've gone into PayPal and reset all my IPN and redirects, etc.

What could be going on? This is hindering my sales because I'm having to manually issue gift codes to everyone after they place an order.