The only way I can think of creating a corrupt save is to edit a pattern that's not really in the game. Say you edit Player 4 pattern 1 when you don't have a player 4 in the game. It'll update a checksum without completely adding all of the pattern details. This can also happen when you add an NPC pattern when there isn't one there.
Last edited by MRDSBOY; 01-11-2009 at 11:22 PM.