Whenever I use 1.9 and newer all servers say "Cannot Connect To Server" and whenever I try to create a new world or open an existing world it gets stuck on "Loading World, Building Terrain" If I click or wait long enough it turns to not responding and crashes. I attached the log but there's not much to see. I've tried waiting up to 3 hours before but it stays on the same screen.
NOTE: 1.8.9 and older work.