Had you already entered the park on the last day when you went and upgraded? I have a 2 day PtP ticket with UE and was wondering about that but probably want to use my UE on the 2nd day, but would lose it if I upgrade before entering the park on day 2. But at same time, if I wait until after I use my ticket to enter the park on day 2, then would I even be able to upgrade my ticket at all?