I'm going to guess that since so many people are slamming into the system all at once (regardless of how prepared Disney was for it) that it's causing glitches all over the place. Some people are seeing no availability while others are seeing availability. Some people are seeing availability later in the afternoon while others are seeing it in the morning. One person I know has already texted me this morning and said that after installing the update they have no more reservations. Their entire park reservations aren't showing up. Good job Disney IT!