I have an Airport Express 802.11N with latest software (7.4.1). It has stopped connecting for AirTunes. In the Airport Utility (from a PowerBook G4) the music icon has a cancel ("O" with "\") superimposed. The Airport Utility from an Intel-based MacPro or MacBook Pro shows the icon properly. In all cases the Enable AirTunes block is checked. iTunes shows the Airport Express in the list but will not play through it. It has worked before.