Not to depress anyone but to encourage those who have yet to book on their 90 day mark, but I got on at 3am (last night) on the dot and had all 14 of my adrs, including crt and ohana breakfasts, cali grill at 850pm, and meals on xmas eve booked by 3:30. I had 10 done by 3:18 and had to check out because you can only have 10 in a cart. It took a bit (2 min) to process my checkout and I started panicking but it worked. The times were very close to what I wanted and they were "regular time" (530 dinners, 830 breakfasts)
I don't know if 3am was necessary - I'm exhausted now, but I'm glad I did it and got what we needed bc I was booking for my whole extended family (8 people) and didn't want to let them down.
And I too had problems pulling up my ressie online up until just wednesday so I know the frustration.