So my second joystick works fine in all the other games I've tried (Mario Bros, Track & Field, X-men, 1943) but it just doesn't register in Smash TV. Interestingly, the coin and start buttons for player 2 do function, but nothing else does. Player 1 controls function perfectly.
Does Smash TV have a weird control layout?
I'm using Mame4All 0.37b5.