And another oddball registration problem. This time is was with paypal.
In Admin section, customer's registration is showing as "Mail in Payment" and that he still owes $82. However, I have received a paypal payment of $82 from him. Normally when I receive a paypal payment through the DTRegister software the item title in paypal shows the event name "2011 Test Event Registration Run" and Custom: test|session=287. For this particular registration that I had problems with, the item title in paypal shows "Event Registration" but it still shows Custom: test|session=286. So the custom field leads me to believe that this registration was still somehow sent through DTRegister.