Since this problem seems to be ongoing, I wonder if pooling some information might get us closer to a solution. Here are my observations; please refute or confirm based on your experience:
1. In every case, if one song on an album can't be found, then every song on that album can't be found.
2. In my case, not every album is affected, but after trying numerous fixes (none successful) the same albums are consistently not found.
3. Some have indicated that music added their library after a certain date is the music that cannot be found. That is not my observation. Sorting my library by Date Added or Date Modified does not show any pattern in my case.
4. I believe the most (but not all) albums which cannot be found also have problems with the album artwork, but I can't tell if that is a symptom or a cause.
Whether the artwork can be seen or not is not consistent. Sometimes iTune's browser window shows the album art, but if you 'Get Info' for any track on the affected album, no artwork is displayed in the get info panes. At various other stages of troubleshooting, the browser does not show the album art either, but then at some later stage, the art reappears in the browser (but never in the get info tabs).
Many, but not all, of the affected albums have art which I have added, using one of two Apple Scripts: a. Fetch Art (v1.2 -
http://members.cox.net/afriesen3//fetchart/index.html), or, b. Find Album Artwork with Google (
http://dougscripts.com/itunes/scripts/scripts11.php?page=1#findalbumartwork).
Most of the 2000 songs in my library were ripped from my collection of CDs, some were purchased from the iTunes store, and a few are mp3 downloads or ripped from vinyl LPs. Many of my CDs are from obscure artists which are not available from the iTunes store, so album artwork was not available from Apple.
Of the 23 albums (or partial albums) I have purchased from the iTunes Store, 9 will play and 14 won't. Of the 9 that will play, the album artwork is visible in both the browser and 'get info' tabs. Of the 14 'bad' albums (which have songs that cannot be found), the artwork is visible in the browser, at first, but NOT in the 'get info' tabs. After looking at get info, on the 'bad' albums the album art often (but not always) disappears from the browser, and re-launching iTunes will sometimes (but not always) cause the 'bad' album art to reappear in the browser (but never in the get info panes).
Sorry for the long post, but maybe with more data, a pattern will emerge that may point to a solution.
Quicksilver G4, was 867MHz, now 1.47 GHz (FastMac CPU) Mac OS X (10.4.8) 1 GB RAM, SeriTek 1S2 SATA PCI card, Adaptec 2930** SCSI card