Unfortunately, in v0.0.1 of my mod, I broke the script and it left a dead copy of itself in saves, which can cause crashes and other nasty behaviour. I am told I am pretty good at save cleaning, so I will leave you with this guide on how to clean your saves. Skyrim uses a game engine called Gamebryo that is probably more than a decade old, starting with the release of Morrowind in 2002.