No, the music went MIA, not the references. I have a QNAP which I've been generally happy with until the last month or so. The drives are showing ok, by the diagnostics but my Time Machine backups were reporting corruption a month ago and needed to do a complete back up and now this. I'm not sure if the latest firmware is causing this, or something physical is going south on the drives or the unit

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Oh wow, I think it its my NAS
To save power since I don't use my NAS at night, I have it set to power down during the late evening and start back up in the early AM. Basically a reboot.
Today when I navigated to the shared folder that holds my iTunes library, my music is suddenly back
The space utilization reported yesterday for my iTunes media folder was 400meg, today 60gig
So the good news is the files are physically there even though the NAS was reporting them MIA yesterday. Funny thing is that yesterday the folders were there but not the songs, for instance I had a Mumford & sons folder but no songs. Today both the folder and songs are there.
Regardless I restored my music library to my rMBP and I'll see if I can contact QNAP's tech support over this. I have a feeling its probably a firmware issue as I think about it