MAC users: GC controller w/ Wii U adapter, Dolphin 5.0 I've tried everything

[zerocool]

I'm using Dolphin 5.0 on a Mac (OS X 10.11.6 El Capitan).  I'm only using it for my Gamecube games, and the emulator works great on my computer, but playing with a keyboard is no fun.  I have an official Nintendo Gamecube controller and I have an official Nintendo Wii U Gamecube USB controller adapter.  

I downloaded the SmashEnabler.pkg.zip file as per all the online recommendations.  I've installed it properly, reset my computer.  

When I go into Dolphin controller configuration, I select "GameCube Adapter for Wii U" as my Gamecube controller, and it doesn't work.  If I click configure, it says "Adapter Not Detected".

Nothing works.  Is anyone else able to use an official Gamecube controller with Dolphin 5.0 on a Mac to play Gamecube games?  

If not, can anyone suggest a good alternative controller?

Any help is most appreciated.  Thanks!

[zerocool]

Ok, I just tried closing the emulator, unplugging the adapter, plugging it back in, and restarting Dolphin one last time. Just... because I'd totally given up. For whatever reason, that last ditch effort worked. It says "Adapter Detected", and without even configuring the controller, it works perfectly.