GameCube Controller Ports 2,3,4 Disabled when using Dolphin Bar

[jmorriz]

Hi,
I am using the Mayflash Dolphin Bar to connect 2 Wii Controllers with Nunchuks.  The Dolphin Bar is set to mode 3, Game Controller Mode.  The controllers connect properly, and I can confirm that they are both working in the Control Panel.

In Dolphin Controller Configuration, GameCube Controllers, Port 1: Standard Controller, I can select either controller and they both work properly:
DInput/0/Mayflash Wiimote PC Adapter
DInput/1/Mayflash Wiimote PC Adapter

In Dolphin Controller Configuration, GameCube Controllers, Port 2: Standard Controller, I can select either controller but all controller inputs are disabled.

Any suggestions would be appreciated.  It would be great to get my second Wii controller working as a GameCube controller.  I can use Joy2Key as a workaround, since it successfully detects input from both controllers, but there are some limitations with that approach.

Thanks!