Since the upgrade to 4.3 mute switch stopped working. Just upgraded to 4.3.2 and it still does not work. I use radio apps "iDeRadio" "The Radio" "Antyradio" to listent to internet stations. When I move the side switch I can see the icon of the crossed speaker but the sound still goes out. Is it only problem with my unit or a general problem? It annoys me very much as I have to keep pressing the volume down button to get quickly mute my iPad.