Thanks for the reply, Douglas. That appears to be a rarity in this thread in the Speakers and Displays topic: "Having trouble with Speaker groups? Read this first"
That forum explains my problem. It turns out that even after the speaker was reset, it still showed in the app as being in a stereo pair. I just didn't scroll down far enough on the settings screen for the speaker. My speakers also take on their old names even though they have been factory reset. Suffice to say, and as the above referenced topic demonstrates, you, Google, have not solved the speaker groups problem and does not appear capable of doing so, which is pretty sad.
