Do you know what version of the utv software you have?
As I recall, 3 versions ago there were big problems with multi switches. I know, because I experienced them until I did an upgrade of the utv software. I forget the exact symptoms, but I do recall something about the tuners not both showing up.
Since you bought a used unit, it might have been sitting for a long time and has old software. I think the latest version is still in the stream, so it might just correct itself if you leave it connected and powered up at night.