Disney IT really sucks. I had the looping problem, too, but fortunately, we had other browsers up that were ready to go. I'm curious if you guys were on computers/laptops or phones? Our phones seemed to work best today.
We started out with 8 or 9 devices. All of them had over an hour to begin except my husband's iPhone, which had 18 minutes. It was actually less than that when it came up--maybe 8 minutes? I *hate* typing in stuff on a phone, but we couldn't figure out how to get the queue ID on a computer quickly enough so we just did my dumbo registration on his phone (confirm email by 7:32). It was probably a good thing as the next device that was ready was my iMac. I tried to register three of us for the 5k but it kept looping between the pay screen and sign in. I must have done it 5 or 6 times, but then my iPhone was the next device ready. Since I'd already gotten the DDD for myself, I just tried to be as quick as possible and only registered my son and husband for the 5k on my phone. It worked! I finished and tried to register myself on another device maybe a minute later and the 5k was sold out. So for us today, the iPhones were the clear winners.
Another annoyance was how when there is an error or something you forgot to fill out, it drops you back at random places on the page--also does this with adding another registration, so it was hard to figure out where I was or what the problem was. I really wish I know who was running things in the Disney IT department and why they can't figure it out!