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Quote from dragonblock1015 I got to re create the world and it did not have the same problem
In u previous world the game information have change.
With the tool NBTExplorer (http://www.minecraftforum.net/topic/840677-nbtexplorer-nbt-editor-for-windows-and-mac/)
u can examine the settings of u world.
And with MC-Edit (http://www.mcedit.net/) u can remove the wrong generated chunks.