Saving broke, how to fix it? (Assassin's Creed 2)

I play pirate, saving in the cr storage SKIDROW 4 folder in the game folder, there was a save, but it broke and now everything is empty in the save selection menu. I tried to create a new save and replace with the old one, but it did not help: the old one does not work, but the new one works. What to do? Passed enough, I don't want to start over.