I've been testing Parole as a quick, lightweight mp3 player for basic playing needs when I don't want to load up a full-blown mp3/media player and come across some strange behaviour.

Only the first mp3 added to Parole will play, any additional mp3s appear to be playing (the slider moves along to the time) but no sound is heard.

I've just been playing around with different things and noticed that Parole seems to mute itself after the first mp3 file, although the app shows that it is still playing to volume.  Moving the volume slider (even slightly) results in the audio being restored.

Adding multiple mp3s at startup (highlighting files and selecting "open with Parole");
Adding mp3s after Parole has loaded;
Opening mp3s individually without closing Parole (one by one) are all affected.

The first mp3 will play normally, any subsequent mp3s will play muted, even selecting the first mp3 (that worked) will result in no sound.  Once the volume has been tweaked, all mp3s appear to play normally.

I've purged Parole and also all GStreamer installs and am still affected by this.