That's your answer? Switch to PayPal Express? Are you kidding me? I had the same problem with OScommerce and their PayPal Standard Payment Module (formerly IPN), and it took me over three weeks to finally find the answer. Somebody posted a quick fix to the file where I had to replace some code. It fixed the problem immediately. Now that I finally moved over the Zen Cart to have a better opportunity for customization (much better than OScommerce), I find myself in the same situation with the same problem.

I can't believe that other people do not have the same issue to the point that it hasn't been fixed in the upgrades. But even more incredible is the fact that we cannot get better help beyond "That's how the "PayPal IPN" / "Website Payments Standard" module works."

Please. Will somebody post the correct fix or point us to the right place from this string? Thank you.