severe chunk loss and errors

hi, a few minutes ago i was happly terraning the area around my house, an then, the game crashed, and when i logged on again, the chunks around spawn were destroyed!! it looked like a jigsaw puzzle of chunks, in one area, the chunks were part of a river, and a few chunks away you could see the missing corner of the river. it was in the middle of a gravel hill, and the place were the river chunk was, there was a chunk out of a hill and trees were spliced open all over the place, when i tried to generate a world with the same seed, the trees were spliced and there were chunk errors all over the world, pleas fix it soon, i like that seed and it took me ages to fined, world download below, just put the files into a folder, give it a name and put it in your world save folder. THIS WORLD HAS NEVER BEEN EXPOSED TO MOD'S, INCLUDING OPTI-FINE