I have my mac connected to the USB in of a PowerGate.
I can then select "Klipsch PowerGate" as one of my audio outputs, and that works just fine.
Occasionally however, it is not available in the list. In an effort to track down this problem I noticed that when I plug the PowerGate into a USB3 hub which happens to have indicators showing active USB ports, the port does not light up, which for me indicates that the problem may be in the PowerGate. I can turn the device on and off, cycle through inputs; I even tried a factory reset at one point...no help. The simple solution appears to be plugging and plugging the PowerGate from AC/mains. Anything short of that has not helped.
Anyone else have this problem or similar? Any suggestions?