Anyway, I'm on windows, this is a desktop, therefore it doesn't have a "Fn" key , the alt key is the right modifier in the game since ALT+F2 (opening debug) works, and googling about this I am not the only one that has this problem.
Can anyone think of a solution?
---POST EDIT
Ok for the record and I leave this , so it's noted in case someone else has this problem and googles this in the future, I found the solution. GeForce Shadowplay experience (which is isntalled btw in like the vast majority of every gamer nowadays) uses that key to toggle fps on and off by default. Setting it up to something else on geforce experience solves this problem.
