There are various audio playlists in which I am unable to hide the Series/Title column, which (I think) is intended for viewing video files.
It appears in playlists when the View As = Music, and disappears when View As = Entire Library (for autoplaylists, replace 'View As' with 'Search').
This is definitely a bug as Music files do not have a Series.
See pic: http://i.imgur.com/03Swm.jpg
How many blooming glaring bugs are there in this version of MM?!?! This is becoming quite frustrating, it seems to be getting worse with progressive releases!