After update (10.7-10.8) Why is album artwork missing, though the artwork is present in Mp3 file?

I recently updated from Lion 10.7  to Marverick 10.8. My library seems to be intact, all files and previous library organization is as previous. Yet, When I am viewing the library, much of the artwork is missing. (Nearly all apart from recent purchases). However, when the file is being played the artwork is viewable in the smaller panel where the currect track information is displayed. The artwork is also present in each MP3 file, (viewed from finder, or via get info).
Am I missing any preference setting? Any ideas?
PS: running latest version of iTunes  11.1.3

Edit: That is updated from 10.7 (Lion)  - 10.9 (Mavericks) latest OS release
* I have also noticed that a fix is to open the info for the first track in each release / album, and press copy+paste in the artwork tag section. Then, artwork is shown for each track in the album.
If anyone knows why this may have happened, I'd be interested to know, as I have a lot of music.

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