Comment 2 for bug 496368

For what it's worth, I just saw this again in the latest bzr head (r2803), so I'm not sure if it's fixed all the way. I got the following in my ~/.xsession-errors:

INFO : Playing file:///home/daw/music/8_foot_sativa/season_for_assault/season_for_assault.mp3
INFO : Attempting to submit "Now Playing" information to AudioScrobbler...
INFO : Submitted "Now Playing" successfully to AudioScrobbler
/usr/local/lib/exaile/xlgui/main.py:146: GtkWarning: gtk_progress_set_percentage: assertion `percentage >= 0 && percentage <= 1.0' failed
  self.bar.set_fraction(self.player.get_progress())

I still haven't figured out how to reproduce it, and I only saw it once.