i guess i got it. i deleted more than the others, an one of them should have been it.
itunes gets covers from itunes store again! yipiie ei yeah!
first i deleted ALL itunes-preferences-files in the user-library:
- the ones beginning with com.apple.itunes. ...
- i found a file called "CDDB Preferences" ... perhaps this was it
- but infact i deleted everything, that sounded as if it could have a relation to itunes or music
- path to those files is [your system volume] / users / [your user account] / library / preferences
- it's okay to delete preferences files; you won't harm your system or software doing so ... the worst effect will be, that the program whose preferences you deleted forgot all settings you entered.
- a deleted preferences file has the effect, that the software writes a brand new one during its next start, hopefully without the errors of the old file, that prohibited your software to work properly.
then i deleted all itunes caches. you find them on several places around the system:
- [your system disk] ▸ [users] ▸ [your account] ▸ Music ▸ iTunes ▸ Album Artwork ▸
- Library ▸ Caches ▸ com.apple.iTunes (this one i didn't delete)
- ... are there more?
itunes semi-behaved like at the first start after installation:
- asked to accept the AGBs
- i had to enter my itunes-account
- but the music library was still there
after all, i guess it was the marked file ... CDDB preferences. but because i did more than one thing, before i restarted itunes, i cannot be 100% sure.
hope this will help you guys.