[Bear_in_RoseBear]

Found the problem with the remotes... another remote (one for a TV that we don't use currently) apparently had something resting on top of it, pressing the buttons, and was putting out a signal that was interfering with our usual remotes. I don't know what activated it, but once I moved it the regular remote started working again. Mystery solved!

[HairOfTheDog]

Huh! :~)