I don't think this is entirely correct, I have similar experience with both Sigma Player and Flowplayer, if tracker is stuck trying to process some file, these two music player will just happily get on with it and let you play the rest of the music that tracker has already managed to successfully index. But the stock Music Player, will insist on displaying the dreaded 'Updating library' until tracker has completed indexing all files (which never seems to happen once it get's stuck )