The world I've had for quite awhile no longer appears in the world select screen. It has just happened recently, as I was playing it an hour or two ago. As I open minecraft to play again, the world suddenly disappears from the menu. I have not modified the world or used any mods that could of corrupted the files. Any suggestions on how I go about fixing my world?
I'm going to bump this topic again, because I decided to make another world since I was stumped of fixing my other one. The world was not modified in anyway and was never moved from the saves folder. Taking it out and putting it back in does not solve the problem. Any help of getting my worlds back in order would be appreciated.
EDIT: On a side note, there weren't any problems exiting the program and I did not receive any recent errors or crashes.