the play queue doesn't work all the time when shuffle is on

i'm using Songbird 0.7 release candidate 1 and when i add songs to the play queue and let it run (with shuffle on) it just plays a random song and removes all the songs from the play queue. this isn't a consistent problem so its hard to test. sometimes the play queue works fine and other times it just acts like there was nothing in it. but so far every time its happened it was with shuffle on.