Invalid Mime Type?

[gnomus]

I just updated to the latest version. MinimServer seemed to take a long time to restart. When it did, I checked the Log and found a number of files (from 3 Beatles albums) were reporting an error. The first one read:

Error: Invalid MIME type 'image/jpeg;charset=ISO-8859-1' at offset 480 in file 24-Bit/Music/Beatles, The/Abbey Road (Studio Master)/01 - Come Together (2009 Digital Remaster).flac (length 49206614)

This error seems to affect all of the tracks from the 3 24 Bit Beatles albums. I cannot see any issue. I certainly never had any report like this before. I see that the three affected albums no longer appear in Kinsky which is a problem.

I don't mind fixing the tags or the album thumbnails if that is what is wrong, but it would be helpful to know what it is that needs fixing.

Incidentally, due to extreme paranoia, I keep my library on 3 separate NAS devices. I get exactly the same report on each library so I think it unlikely that this is a file corruption problem.

It would be nice to get my albums back... Any ideas?