Saves from before v0.40 are probably incompatible, I've added instructions and a save with progress up to chapter 10 instead, not really the best work around but its the best I can do.
Thank you for the quick reply, and the solution; it might not be a favorable one, but I can always try to recreate my save using the file from level 10, as strangely all my characters are fine for chapter 13, but immediately after is when the strangeness hits, so I can use a save editor to clone my characters stats over