Audio output not working with MacOS High Sierra

[bryan.gough]

I use a Mackie Big Knob Studio monitor controller to switch between headphones and monitors on a 2013 Mac Pro.

The Mackie BKS controller is a USB plug and play device. It just works... or did.

I updated to High Sierra (unwittingly) and discovered that my current setup no longer works. The Mackie USB still shows up in the Output/Input list in System Preferences/Sound/ but, selecting it does nothing. No sound comes out. I do get sound if I use the default system sound.

I realize this isn't exactly an Adobe Audition problem... but, I was hoping someone in the Audio Engineering world has either run in to a similar problem, or is willing to help me out.

Mackie's forum is non-existent—but I don't believe they caused the problem.
I posted on Apple's forum, the agency responsible for the problem, but haven't heard anything back.

I really prefer the Adobe Forum community, so I'm hoping someone else here might have some insights on this.

[John Yuelkenbeck · Accepted solution]

You're right that their forum is lacking, but how about posting on their Facebook page? It looks like someone from the company monitors it, so you might get a quick response even if all they tell you is they are aware of the problem and looking into it.
https://www.facebook.com/Mackie