Hi,
I can (more or less) reliably freeze XMPlay by playing a song, quitting XMPlay, moving or deleting the song so that as far as XMPlay is concerned, it does not exist, then running XMPlay and clicking Play. XMPlay will say "opening..." and be frozen/unresponsive. This does not ALWAYS happen, sometimes it will display the config panel overtop the main panel?! but it does happen a lot of the time when the file does not exist.