I was using iTunes match in 5.1.1 after upgrading to iOS6 my music app was unusable. music apparently still in the iPhone but in Lists, Artists, Genius Taps no song names showed All appear blank!. If I touch a the white area the app apparently starts playing a song but really nothing happen no sound no nothing. I searched in Apple forums and found that the playlists database files are corrupted I'm pasting the solution that fix the problem in 3 minutes.
Enjoy!
"The iExplorer method worked for me as well, with a few slight modifications.
iTunes Match stopped working on my iPhone 4 (Music app would either show 'No Music' or a cloud icon w/ a blue progress bar that would barely move). Toggling iTunes Match on and off did not help, nor did syncing with iTunes on my MBP. I wanted to avoid a factory reset but I was pretty sure some core music library files were corrupted.
I determined that I did not have to delete the entire 'iTunes_Control' folder to get Match working again. I used the following process:
1. connect iPhone, open iExplorer
2. navigated to iPhone\Media\iTunes_Control\iTunes
3. copied these 3 files to my desktop:
MediaLibrary.sqllitedb
MediaLibrary.sqllitedb-shm
MediaLibrary.sqllitedb-wal
4. deleted the same 3 files from my iPhone
5. performed a hard reboot on my iPhone (home button + sleep/wake button, hold until you see the apple logo)
The reboot forced iOS to recreate the 3 MediaLibrary files. After this, I was able to turn iTunes Match on and my entire library showed up on the iPhone. I am able to redownload tracks as needed now."
The original solution was found here: https://discussions.apple.com/thread/3865948?start=0&tstart=0
Enjoy!
"The iExplorer method worked for me as well, with a few slight modifications.
iTunes Match stopped working on my iPhone 4 (Music app would either show 'No Music' or a cloud icon w/ a blue progress bar that would barely move). Toggling iTunes Match on and off did not help, nor did syncing with iTunes on my MBP. I wanted to avoid a factory reset but I was pretty sure some core music library files were corrupted.
I determined that I did not have to delete the entire 'iTunes_Control' folder to get Match working again. I used the following process:
1. connect iPhone, open iExplorer
2. navigated to iPhone\Media\iTunes_Control\iTunes
3. copied these 3 files to my desktop:
MediaLibrary.sqllitedb
MediaLibrary.sqllitedb-shm
MediaLibrary.sqllitedb-wal
4. deleted the same 3 files from my iPhone
5. performed a hard reboot on my iPhone (home button + sleep/wake button, hold until you see the apple logo)
The reboot forced iOS to recreate the 3 MediaLibrary files. After this, I was able to turn iTunes Match on and my entire library showed up on the iPhone. I am able to redownload tracks as needed now."
The original solution was found here: https://discussions.apple.com/thread/3865948?start=0&tstart=0