[Graham68]

@Geeeronimo  thanks for the flac file. I am delighted to say that I can repeat the problem with it
It plays from file view but not from library, so now the funs begins.

Logs useful too. I may need to pass that download link to other devs, so could you leave it up for a day or so just in case.

Edit: It does seem that the file is corrupt - I can't get any other media players on Windows to play it. But Kodi in file view does. I am bemused that when passed from library the same file is mistaken for mp3. Meanwhile the libary entru it creates is fine, so not a library fault, just different paths to the player producing different outcomes

BTW I rip my music to FLAC using EAC, so generally I think that process is fine.

 I don't believe the files I have issues with have any corruption as they play ok through VLC on Windows and Plex and Emby servers on Linux also serve them up ok.  It certainly is an odd problem!