Hey @AvA,
The musicplayer for most parts uses Windows end-line formatting (^M) which certainly will break mpd scan. In addition, included in musicplayer file chunk operators (stop points) are program specific.
At the root of the folder mounted to the Volumio please create file:
.mpdignore
with the following content filters:
*.cue
lost+found
*.ZIP
*.zip
You can extend filters (one per line) for every alien non-music file format reported in mpd.log file.
Kind Regards,