Now that you mention it, I do recall last week, a time where the program was sluggish. I hadn't done anything directly with that playlist, but when I tried to exit, it said it wasn't done saving. So I waiting a little longer and tried again. It said the same, so I figured it must be stuck, so I said yes, and it exited. That had to be it. So something caused it to stick before I closed it, but that must be it.