When the Halloween update came out I deleted my file and started a new one. It wasn’t long before I reached the nether, when I was building up my fort, under fire from ghasts I suddenly crashed and I had to manually shut down my computer to get out of Mine Craft. I had never had problems with crashing before. When I went back, all my recent work was deleted, which is typical for a crash. About a minute later it happened again, unwilling to start my computer up again, I gave up and went to bed, the next afternoon I found file one empty. (The file I was on) Once again I made a new file 1. One of my other files made it to the nether with no problems, but when file 1 once more reached the nether, I found my self in my previous file 1’s nether. When I exited the nether I was in my old file 1. At first I was not sure if this was a good or bad thing but now im happy to have my old file back.
Today i realized that when i died i was back in my recent file, meaning i can travel inbetween both.