Looking at my quest log, I see that although I seemed to complete The Greedy Street Spirit quest, it's still telling my that I'm already doing this quest.
www.flickr.com/photos/dopia...
So, it seems to be stuck. As far as I can tell, I went through all of the motions to complete it and exited it normally. It doesn't seem to have registered as completed though.
One thing worth mentioning: whilst doing this quest, I hit the Retina MacBook Pro Disappearing Layers bug and fumbled blindly through the last pane of the story, unable to see what was happening. Maybe I missed something?