I'd that problem with nintendo black wiimotes coming from asia 2 month ago : the buttons did'n work in game, but they rumbled in dolphin. Only Bluesoleil v6 could run them i ndolphin. Now i've bought nintendo (one black one white) made in germany and i don' have any problem (i use microsoft bt with windows 7). Maybe there is a small difference between wiimotes that cause this issue. This issue was also related but closed because the developpers have not this problem witch doesn't appeared with all wiimotes and so they don't experience it. Now, i know i was not crazy et there is really a problem in dolphin because i'm not alone.
HP core i7 860 / 6 gb / gt 220 1go / windows 7 64bits premium