A couple of days ago the WIP didn't want to start anymore on my XBox too, and I narrowed the cause down to the fact that I had deleted the default skins. It seems that the .ini had become somehow corrupted and since there was no standard skin, the program hung itself up during the start. After copying them back to the right folder the emu worked again like a charm.
Chaz
P.S. A little suggestion: I don't know if it's technically possible, but I'd like to see .SPC-sound support for the menues, since then you could have original SNES-music playing and save a lot of HD-space compared to equally sounding MP3s.