I can not open my worlds in 15w34b, it does not stop say "Downloading terrain", but in game Music plays.
Comments 5
If this is still an issue in 15w37a, then please attach the complete output of the "Game Output (Your Minecraft name) " which can be found on the fourth tab of the launcher to this ticket.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".
Unable to reproduce right off the bat. Was able to open up all three of my worlds just fine.