I think I found a better yet fix: Delete all .cfg files in the main directory, and all .cfg.bak files in Launcher_data/. Then launch KSP.exe directly, i.e. NOT through the launcher. For me, the first boot after this, the loading screen was slightly messed up, like it sort of remembered the settings but not really. It was back to normal the second boot. -E- But NOT physics.cfg as that breaks things.