We were 9 people testing this more than any other release, and not one of us had a single problem with our saves. Unfortunately, when the game was out, it was too late, as any fixes would have had a big chance of ruining new saves made after the release, so I was in a bit of "between a rock and a hard place". I still spent around 6 hours trying to fix it, to no avail.
I would still recommend you to try and load a save made before chapter 7, as they seem to be running fine.
Truly sorry for the inconvenience.