[Simon6785]

Thanks for trying that! I checked the setting to override Title Information, but I didn't delete the Database and rescanned. Now everything is exactly as it should be!

-> Load the whole Database in Picard
-> Options exactly as in the first Post
-> Write everything (Takes Time... ^^)

-> Delete Database
-> Setting "Override Title Information from Internet" in Music options set
-> Setting "show Artists only in compilation" not set
-> Rescan whole Library

-> Problem solved