On Tue, Dec 19, 2017 at 09:36:11AM -0800, Charlie Gibbs wrote: > Follow-up: I've just come across MP3 files in my collection for which the > new mplayer _does_ display the tags. Maybe it's just becoming more picky - > which isn't really a Good Thing. Postel's Law says, "Be conservative in > what you do, be liberal in what you accept from others."
Could be id3v1 vs. id3v2 tags. Try some of the command-line tools to see which tags are present on which songs.