Well, I’m stumped. Clearly you have enough permissions to create the file there in the first place, because when you delete it and run the game it comes back, correct? But then somehow you’re not able to update it once created?!
Ok, I’m going to add some debug code in the v.136 update to log more information about why the save is failing. Will keep you posted.
Update: Actually, this could be related 🛠 Troubleshooting - #6 by InterAction_studios and something is deleting the file contents after the game is done with it. Can you run the game, redefine your keyboard keys (just press random keys), quit the game, wait 10 minutes, and then send me your C:\ProgramData\InterAction studios\CIU\steam\135\CIU.hst file?
Actually, do you see any file in that folder ending in hstknowngood?