User blog comment:Fastolph Cottar/Terrain regen bug/@comment-4521126-20111112104143/@comment-4583259-20111112202334

See my new blog entry, User_blog:Mrob27/Internal_Data_Format. I believe what's happening to you is the game screws up the "0_0_0.mw" file somehow, then regenerates it from the "0_0_0.hm" file. (but with whatever world number and X/Y coordinates in place of 0_0_0)