I found this rude behavior a month ago with 8.0.289 and then again last night with 8.0.318.
I'm doing my notebook DJ gig with 200|PLS| tracks in Playing Now. With that long of a list it's too much trouble to drag a track from position 206 to postition 5 to play next, so I use the 'send to next' feature. This copies the track and now I have one copy at 6 and one at 207. I go into Media Library to look for my next choice to play. While there, the song playing moves on to the next song (the one I just copied from list position 206 to 6). I get back to Playing Now in time to find that the song playing is NOT the one at 6, but the one at 207! Yikes! The song after 207 is NOT what I want to play next - I wanted #7 to be next. This might be a minor inconvenience if I'm play music at home, but when I'm play for a gymnasium full of people, I can't afford to have a goof-up like this. For me, this IS a show stopper.
One other rude behavior I found to be only annoying: when down the list around two-hundred-something, and the song changes from one to the next, the view jumps to the currently playing track, leaving me wondering where I was when I was so rudely yanked away.
I love Media Jukebox because of the integration between database and player, but if this behavior continues, I'll have to use some other player for my DJ jobs. That would make me vehwee vehwee sad. Please, can this be repaired?