I feel terrible having to write another one of these. There was a new issue in the 3rd day of qualifying that caused one of the leaderboards, usually only 100 players, to grow to thousands. Players on that leaderboard were unable to load the Showdown section of the game because of the amount of players on the leaderboard AND all of those players were told they missed the cut.
We're working on solutions for those players right now and I will update this post with information as I receive it.
Thank you so much for your patience.