Originally Posted by Valo
Edit: I rewound a bit (to Chapter 6: Ben Screws Up) on the only save that it was letting me access and finished the game again. All the saves are working correctly now. Maybe you only have to redo the last chapter (Chapter 7: Penultimate) to fix it, I dunno.
This works. I rewound and only replayed chapter 7 Penultimate and I could again access the other save files.