It is just that particular save, I've loaded from an autosave and gotten back up to that point and both overwritten the save and made a new save and both work now. Other saves did load correctly as well.
Whenever I try to load my save in Geneforge Mutagen, it crashes. I've restarted my computer, I've uninstalled it and reinstalled it, and even done the same for steam. Does anyone know what to do to fix it? Mutagen is 1.0.1 and I'm using Windows 10.