@jonas
Thanks. I tried that, didn't work, but it did cause me to wonder if there was something about the track (that I wasn't previously familiar with) that might be causing the problem. I put the output settings back to the wrapper sink, tried to play another track, and...it worked. The track that had me convinced something was wrong just had a significant period of silence at the beginning for some reason.
Complete pilot error. Mea maxima culpa.