Currently Being ModeratedDec 18, 2012 8:36 PM (in response to MrvdG)
I noticed the same problem tonight. I upgraded to iTunes 11 on Windows 8 on 11/29, and I also bought a Mac Mini 2012 last week and duplicated my music collection on there downloading via iTunes Match. I noticed tonight when I synced my iPod Nano (7th Gen) for the first time in a few days that my free space jumped a bit. I have a playlist with all of my 4-star and 5-star music on it, so the change caught my eye. I looked through my ratings, and there were entire albums of songs that I hadn't rated yet suddenly rated. Other albums had incorrect ratings.
I believe it happened in the last two days in iTunes 11.01 on the Mac Mini, but I can't be positive. I have an 11/29/12 backup iTunes Libary (itl) file on the Windows machine, so in a pinch, I might be able to find a 10.7 version of iTunes, take my PC offline, open the backup library file, and export or print or do something with my ratings, because I have several years of off-and-on effort into those ratings, listening through and manually rating 3,000 of my 5,000+ songs.
Currently Being ModeratedDec 18, 2012 9:15 PM (in response to John Fenton)
I was able to uninstall 11.0.1 on the Win 8 PC, reinstall 10.7, *copy* my 11/29/12 backup iTunes Libary, open it, and I have my ratings back--but only on the PC, and only until I let it connect to the Internet. As soon as enable an Internet connection, and let it phone home, it overwrites the ratings with the messed up ratings.
I have a ticket opened with Apple for support.
Currently Being ModeratedDec 19, 2012 8:03 PM (in response to John Fenton)
I fixed the problem today with the help of Apple support:
0. Backed up iTunes media folders on both my Mac and PC as a precaution.
1. Downgraded to iTunes 10.7 on PC. (This would not have been necessary if I'd had a backup iTunes 11 library.)
2. Opened iTunes 10.7 holding down shift key and choosing to open my backup library file (copied to the iTunes folder).
3. Turned off iTunes Match before it manages to call home and overwrite your local ratings with the iTunes Match ratings.
4. Went to my Mac Mini and deleted entire music library, electing to also delete the files from iTunes Match.
5. Wiped all my music from my iPad. Turned off iTunes Match. Turned back on iTunes Match and confirmed an empty library.
6. Went to PC, turned on iTunes Match and allowed to match music. This worked better than expected, as my "deleted" library was somehow not completely deleted. Matched tracks were matched as expected, but previously uploaded tracks instantly appeared as uploaded after the library was scanned, without being reuploaded.
7. Restored iTunes library on Mac, by adding the iTunes Media folder back and then turning on iTunes Match.
Voila ratings restored on both machines.
If you had just one computer, I think you could delete everything from iTunes Match using the library with the corrupted ratings. Then open the backup library file with iTunes and add everything back to iTunes Match.
Currently Being ModeratedJan 26, 2013 10:26 PM (in response to John Fenton)
Did Apple Support tell you why this happened or give you any expectation about what to expect?
Currently Being ModeratedJan 27, 2013 6:32 AM (in response to Cheryl CK)
No. The woman I worked with was very helpful and followed up repeatedly to make sure I was able to fix it, but she didn't have any idea why it had happened. It was not a documented problem at her level.
Currently Being ModeratedJan 31, 2013 1:38 AM (in response to John Fenton)
Will this work if one only has a windows computer? My brother doesn't have access to Apple support.
I always create 5 ratings playlists, 1 star, 2 star etc. and copy the relevant files into them.
So when I upgrade, do major maintenance or export a playlist for someone else, one can always go back to the folder and add the relevant ratings to the songs in the playlists.
I upgraded back to iTubes 10 by de-intalling 11 on my Mac.
Certain essential features (like having two windows open at the same time so one can drag songs into a playlist) are missing.