I have SSBB running from usb loader gx. Wifi connection and wiiconnect24 enabled (although i dont think this is necessary)
Mario Kart works fine online, it takes about 2 minutes to find players and start a game. But SSBB takes literally forever (i've not yet managed to start a game online, it just sticks with 'seeking...' and the white dummy bag....)
HOWEVER, I can spectate any other game without problems. Any ideas???