Whenever I try to play the game at all, ever 5 seconds or so I get the same popup saying my settings failed to save.
I've tried deleting all the save files: i.e. /home/username/Documents and the Documents folder in the Heroic prefix, but that didn't work.
I've tried swapping between the two folders in the Cloud Saves Sync menu but that didn't work. Also tried swapping between Wine, and GE-Proton-10-32. Neither fixed it.