ITunes :: Music In My Playlists Won't Shuffle

So I updated my MacBook Pro last night and now my playlists wont shuffle correctly. When I turn on the shuffle feature and I have a column selected (number, rating, etc), all it does is rearrange the songs. it's not a real shuffle because I can still see which song is coming next (ie, songs 1, 2, and 3 might become 3, 1, and 2, but they'll still play in that order). When I turn on the shuffle feature without any column being selected, nothing happens. even though the shuffle button is blue, the songs in the playlists play in their exact order. the shuffle only seems to work properly when im playing music out of the entire music library, not one playlist.