I don't have Mala Trees set up.
I have my Mame Mala lists sorted by game type, controller type, year, etc.
When I open Mala, it goes right to a list of these hierarchies, and then I press left to drill down to the games within each category.
Once I choose a game I want, I press left again and it loads the game.
I mapped a button (keyboard encoded with ipac) to switch emulators.
My SNES list is NOT sorted by hierarchies - it's just a few games, so the whole list of games appears when I switch.
Once there, I can scroll through the list with my joystick (up/down) but no matter what I do, I can't get any SNES games started from within Mala - I've tried mapping buttons (keys), I've tried mapping joystick presses, etc.
I may try trashing my Mala config and starting over tonight.