Artwork not showing

[paulr]

Hi, I have a library of flac files on a NAS and Minimserver 2.2 running ok on there.
I have a NAIM streamer with it's own control point app and served by Minimserver.
I also have a Bluesound box which has it's own way of indexing the content etc (i.e. it does not use Minim).
I use JRiver on my pc which also has it's own database.
Artwork is embedded in each music file, there be the odd missing one, some albums may have a jpeg file present in the album folder.
My problem is that the Naim app has suddenly stopped displaying upwards of 90% of the album artwork and I'm trying to troubleshoot this. I cant find anyone else in the Naim community with this happening i.e. I don't think its the Naim app, I don't believe there is a general minim problem, but that something has happened on my setup.
Both the Bluesound and Jriver apps show the artwork ok.
The artwork has not changed, not on 70000 files anyway, my minimserver settings have not changed.
Also I’ve noticed, while troubleshooting, the ‘recently added’ contains only stuff from a month or so ago, it should be much more than this. Both Jriver and Bluesounds’ recent views hold much more stuff i.e. more like what I’d expect.
I’m pretty certain something has happened to cause minimserver to be ‘corrupted’.
Two sides to this – 1, what has happened, 2, how do I put it right.
Any pointers would be greatfully recieved.