Dawnut, you mean where the game crashes if you even TOUCH the settings, or any buttons, for that matter?
I think I had this happen to me in WFAS, can't change settings without a crash. I first noticed it when my multiplayer avatar was displayed in low-graphics glory. After the first time (where the game could boot up) after that the play button made the game crash, so I was almost thrust into the verify files and uninstall buttons, which I REALLY did not want to do as I had a few years' worth of modding work for captain-coop for myself.
It was a few years ago and I think I fixed it by deleting all mods other than native, because my foolish self copy pasted the native module into the modules folder (what I should have done: put it in a backups folder), since I was experimenting with troop trees and didn't want any irreversible game breaking changes, so there were 2 natives in the same folder.
Try the tech support bible if the game keeps crashing, (I wasn't even sure what actually fixed it for myself) https://forums.taleworlds.com/index.php/topic,107644.0.html