Hey Hydroguy,
Great thread... helped me a TON last year when we went during Thanksgiving.
I should have responded earlier when I still remembered the issue, but one thing that happened to us that maybe you can clarify in case someone else has same issues. We booked the Fantasmic Dessert Party seating, I showed up 7PM to get our seats and I was speaking to the CM's there about it. They asked me if I had checked in at the Guest Services to get my tickets (paid online in advance), but I hadn't done that, I just had a copy of my receipt. I believe they showed me a place on the e-mail where it instructed me to check in at GS first. I literally had to run to the front of the park, check in, then run back in order to be in line to get a good seat. So just a pointer to those booking it, check in at GS 1st thing when you get into the park to make sure you get your tickets.