Seemingly random world generation crashes

Re creating the world fixes the terrain. This has happened four times in the span of ten minutes creating new worlds. 

Beautiful terrain, isnt it?

http://www.mediafire.com/file/4s7rn7na2la0gj3/New_World.rar

http://www.mediafire.com/file/0on1s5u6dgifca3/New%20World-.rar