For what it is worth some people like to be able to scout and see hidden attributes of players, sometime even the players on their team. Until SI develops their own editor people will always use "unofficial" editors. It is something that you should consider for the future.
Further, I feel confident that it was not the editor that caused the problem. I only mentioned it for transparency. The game had previously saved at the same places. I think something malfunctioned with the last update. Since then it has not been able to save. To refuse to look at the dump files because I have used an editor seems unreasonable. There seems to be a real issue with Football Manager itself.