In this screen shot, the queue screen is showing both tracks, the one I selected, and the one playing... this may just be another example of the same thing, if so, then please ignore...
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I am wondering if this happens because my Pi only has a WiFi connection? This was all in one room, so the signal is normally pretty strong, even though the data rate is slow. (The data rate over WiFi is not an issue for me, since it is more than fast enough to stream most audio files.)