Overall, I'm now comfortably 'meh' with itunes 11.1... I'm making good use now of the "up next" feature (almost never used the dj feature of 10.7), and I must say, once you can wrap your brain around that "play next / add to queue" feature without accidentally borking anything at some point, it seems fairly OK.
... But..... Is it just me or is there a bug that if you comb through your collection and add enough individual "up next" songs, it decides on its own without any prompting to just play everything in the currently selected playlist after the ones you explicitly added?
Background: I have a "master seed" smart playlist that filters out certain static playlists and has date/rating/not recently played criteria... At times like tonight, I'll go through that playlist (which is most of my library) pick some songs and "add to up next"... I'd check the list as I was going along and it seemed fine at the start... At some point I noticed after about 30 songs or so, it decided to also add a "resume playing master seed" at the end.... This is maybe the third time I see it did that.
I didn't tell it to play the entire playlist... Not now, not any of the other times... At least I don't think I did...