It'll disappear if there's no content in the directory, more specifically if there was no metadata imported into the library from that path.
Just saying something doesn't work doesn't help anyone understand your problem or how you've configured your system.
A good start would be to let us know what kind of share is it, is it an SMB/CIFS share or an NFS export or something else?
As you've logged onto the Pi in order to look at the mpd log, have you looked to see if the share is mounted and you can see files in there? e.g.
The above df command will show you a list of mounted filesystems, the find command should show you a recursive list of everything under /mnt
Just saying something doesn't work doesn't help anyone understand your problem or how you've configured your system.
A good start would be to let us know what kind of share is it, is it an SMB/CIFS share or an NFS export or something else?
As you've logged onto the Pi in order to look at the mpd log, have you looked to see if the share is mounted and you can see files in there? e.g.
Code:
df -h
find /mnt
The above df command will show you a list of mounted filesystems, the find command should show you a recursive list of everything under /mnt