Same issue as others -
MDE won't allow me to complete a reservation for late August. I've tried several times for different days, times and restaurants, as well as used different browsers and incognito/private modes. All give me the "paws" email. My dates are highlighted in the reservation system, so it recognizes my resort stay. I received the email yesterday about being able to make reservations.
I kept my cancellation notices - I went back and saw that I canceled several mid-June ADRs on May 29 (one day after the May 28 start window for today's advance ADR opportunity). I have cancellation numbers - assuming I could ever get someone on the line (all circuits for the 6690 number were closed by the time I tried and it just told me to call later - at which point I expect they'll tell me there's nothing they can do).
I do wonder, however, whether the fact that I actively canceled my June ADRs may have affected this. I did not wait for Disney to remove them - which has led me to consider the possibility that accounts flagged for advance ADRs today may have depended on whether there were ADRs in an account when Disney itself purged them. Someone else probably can show that this isn't the case and this is just another weird IT glitch - but after issues with making park reservations with my resort stay, and then with my AP, and now with ADRs, it's just becoming more hassle than it's worth.