One of the main frustrations I have with the latest version of Spotify for Windows Phone 8.1 is the management of the play queue.  I've accidentally added an album to the play queue (sometimes more than once).  When I do, there is no way to clear or edit the play queue unless I navigate through each track and stop at exactly the last track.  If I navigate too far, it goes back to the top of the queue.  Also, if I pause the music and go back to the app, the play has stopped and there is no way to restart the queue until I play a song.  At that point in time, it plays the first song, then plays where I'd left off in the queue before.  The queue functionality seems to be very poorly thought through or tested on this device.  If it's going to be this bad, I'd rather just turn it off altogether.