Oggs or MP3s? Weird, never had that, but I had GStreamer admit a number of times that it wasn't happy with my Ogg Vorbis, usually some of the Bach, that had quite long Vorbis comments, which unsettled it or something? Been a while since I debugged this... XMMS would simply crash sometimes, but would play the file after restarting it, so it didn't seem to me to be the file itself?

And I see your comment, "reply" makes the reply box appear right in the page.