Jackson Hill

Yeah is there anyway to salvage the worlds that have been affected by this?

I am also having this problem. The loading bar will almost completely fill, ending at the "generating world". The game doesn't freeze, it keeps playing the music and scrolling through tips. I can still edit the world and make copies of it, but neither it nor any copies actually get loaded up. I've seen some other people reporting similar problems on other websites, and like me, it began when they tried to load up the save after exiting in the nether.