Ok. So I've updated iTunes (ver 6.0.2) and both my airport expresses (ver 6.3) and all appeared well. However when I try to play music through both airport expresses it only comes out of one of them. Also the second airport express will only play music if it is selected alone (i.e. without the computer and any other remote speakers). The problem looks to be with the second (remote) airport express and not the main airport express (the one connected to the internet). Anyone got any ideas what is wrong?