Nope, ctrl backspace works for me... Oddly enough though, through trying to find the config files to edit, i accidentally started mupen through the terminal. Now sometimes i get the version of the gui with small icons, sometimes with the large icons (which i beleive i got before when i installed the custom config) but then a couple of times i've got a gui which seems to have its own theme?

I am slightly confused, i reckon i've ended up with 2 seperate installations somehow...