I was trying to allocate more ram to java using a tutorial to eliminate some lag from the game, and after getting error messages I decided I could live with the lag and opened minecraft to continue playing. As soon as i opened it it began an update bringing it to 1.4.6 I believe. When I opened my load screen my world list was empty! Fortunately I still see it in my saves folder so I know its not deleted... Does anyone know how I can bring it back? or update the specific world? I would really appreciate any help!
I dont know if this is pertinent information but the tutorial I used can be found on this page: http://www.minecraftforum.net/topic/603315-why-does-my-minecraft-lag-so-much/
Also, in trying to get the ram allocation to work, I moved my minecraft folder from program files in the C drive to the dekstop.