So now , after many other multiplayer problems , i cant get into my original survival map that ive put hours and hours into. I cant believe this can happen. Ive re-installed the game and tried multiple times, when i get into the map i just see stars and it never loads or lets me move, freezing the whole system. i can however enter my less important creations. If this is not dealt with there will be a boycot.
How can you boycott something you have already purchased?
learn from this and move on. Always backup your world saves on a regular schedule. Also as others have suggested, try using MCEDIT to stabilize your world save.
And give more information on your problems so that some can help such as your system specs, Minecraft version and mods installed etc.
http://www.minecraftforum.net/topic/137381-official-corrupted-save-recovery-thread/page__st__1340__hl__ world save recovery#entry29448840
learn from this and move on. Always backup your world saves on a regular schedule. Also as others have suggested, try using MCEDIT to stabilize your world save.