I don't know if this is an old bug or not, but one of my smartlists is set to show 4 and 5 star songs and it somehow changed to 4 only, even though it said 4, 5 in the pane thingy. Maybe it's because it was an old smartlist that was created when MC's interface only had the text input instead of the wizard interface. It's the smartlist I use daily, so the last time a 5 star song was played, it was on the 8th. I'm thinking that it happened in this build, since I think I was using build 428 during that time.