I have the problem with recent versions of Dolphin, currently I've tested with version 4739 and no luck, I'm using Toshiba Bluetooth v7.10.04 x64 Dolphin x64 and cirago USB bluetooth adapter .
When I try to play a game the lights of my Wii mote turns off, then when I stop a game then the light 4 of my wii mote turns on, then when I play again a game the lights turns off, I didn't had this issue with previous version not remember exactly but I think were just the recent versions that had this issue, I saw this in a few versions before 4 wii motes were enabled.
Sometimes I can play (light 1 turns on) but most of the time the behavior is as I've mentioned before.
When I try to play a game the lights of my Wii mote turns off, then when I stop a game then the light 4 of my wii mote turns on, then when I play again a game the lights turns off, I didn't had this issue with previous version not remember exactly but I think were just the recent versions that had this issue, I saw this in a few versions before 4 wii motes were enabled.
Sometimes I can play (light 1 turns on) but most of the time the behavior is as I've mentioned before.