So recent saves will load once, but after that, loading any save or returning to the main menu causes a crash? (during the 'cleaning up session' procedure)
Yes.
Luckily I had a rather recent save that works fine. It does seem like something was corrupt in them, But it was weird because loading into them initially worked fine. I'm also having an issue where sometimes when launching the game audio only plays when the game is minimized; But its fixed by just relaunching the game so its not really a concern. Thanks for bothering to reply.