@forgetting settings… Oops, stupid brain not controlling my fingers properly.
I’m all out of ideas then I’m afraid 🙁
I think you may have to have the overlay active, I have never bothered turning it off to try otherwise.. I have known it to not work due to conflicting with an in-game key mapped to F12 but that shouldn’t be the case with TF.
I doubt it being the install drive, my steam is installed on D, with a secondary game folder on C: (ssd) for some of the games which I play the most, but D: is the default install with the steam executables etc.