When I was making a city world(that I just started).But then, when I exited the world and pressed the "quit game" button, I was expecting(not really)that the world was still there. What I got was two worlds not there,but found them in the C:\Users*username*\AppData\Roaming\.minecraft\saves (Their names are "World" and "New World").
Comments 3
To the mod, I believe this person is talking about the World selection list (like this http://i.imgur.com/ipAnk.png). I think they're saying that their worlds aren't showing up there, even though the worlds are still there in the saves folder.
{{C:\Users\<USERNAME>\AppData\Roaming\.minecraft\saves}} is the only path for worlds being stored.