So basically this is two separate problems with an only superficially similar symptom:
1. one, where columns are supposed to be available by default but instead are showing up as unselected, but which can still be selected by the user if wanted (Library, AutoDJ, Playlists, Crates)
2. another, where the columns aren't in the code in the first place (iTunes, Rhythmbox, Browse)
So basically this is two separate problems with an only superficially similar symptom:
1. one, where columns are supposed to be available by default but instead are showing up as unselected, but which can still be selected by the user if wanted (Library, AutoDJ, Playlists, Crates)
2. another, where the columns aren't in the code in the first place (iTunes, Rhythmbox, Browse)
?
This is a question :)