They changed a year or so ago to only accept reservations from 11-12 and then walks-ups after that. That said, my guess is your ability to book was not a glitch and just another time disney is being completely schizophrenic with their "decisions"
Maybe it's a seasonal thing. I'd hate it if they went back to requiring ADRs all the time. We are not an advance ADR type family since we rarely even know what park we are going to until we get out of bed and if we have to ride a bus, we usually just hop on the first bus to arrive. We love TS so not having to make an advance ADR is perfect for us.
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