So after months, i've found something : the wiimotes buttons don't work in certain games if in the config>gamecube the game controllers are not put on "nothing"!!!! Try with dragonball z tenkaichi and smackdown vs raw 2010 and you will see!!!! This is an issue i hope will be resolved!
HP core i7 860 / 6 gb / gt 220 1go / windows 7 64bits premium