Un-Mute does NOT work

As stated when (after pressing) we try to un-mute the volume level remains to 0 and does not return to previous state as it used to with previous version 1.4.2

Other then that, it works like a charm.
Thank you 🙂

Using wordpress 3.7.1 and plugin v.1.4.3

http://ww.wp.xz.cn/plugins/wp-miniaudioplayer/