After the update to the latest Nightly, i have this problem. In some cores (like Nestopia or BSNES) the “X” button doesn’t work wherever i map it. In other cores like Genesis GX plus it works. Is it just me?
Edit: Nevermind, i figured it out.
It was just Nestopia. For some reason the turbo “B” function and normal “B” where both mapped on the same “X” button. Maybe this was added recently?