Today a singleplayer world started gambling for a few hours and then intentionally disconnectet (saved). Wanted to join again, but did not leave. If I want to join the world garnix is there (not even something like "world is loading…") and my usually relatively loud PC is very quiet, so stop working. If I click aufn screen then there's "no feedback" and so on and the whole game breaks down. PC restart brings nothing.
Ok that's funny. And are you coming to another world? I would delete all worlds from the .minecraft folder. How to get there, have a look on YouTube.
No, other worlds do not work either. I'm usually a real fox on the subject of Minecraft, but I've never had that: /