So sorry man, I have absolutely no idea what causes this. D can open the developer menu if you hold shift at the same time and have the renpy developer stuff downloaded (And also you're running the game through that) but outside of that, it shouldn't do anything at all.
The majority of what you're talking about though will be in a persistent file which will be stored in, C:\Users\Yourusername\AppData\Roaming\RenPy\Stormside-whatever
Delete that file, and it should get rid of anything that persists between save files. It'll reset your gallery too, but that's better than the game not working. (Also you can fully unlock the gallery at the end of the content without needing a mod, so you're fine)