I have installed a new Airport Extreme 802.11n which works well with my computers, but my Airport Express 802.11g (2 of them) have disappeared from view in my Airport Utility. I can only seem them if I directly connect them with an ethernet cable. AirTunes seems totally off line and I'm wondering now if the new Extreme is incompatible with the old Airport Express devices. I have tried many configurations and have attempted setting up the new Extreme in different manners including allowing the network to be extended. Currently the radio mode is set to 802.11n (802.11b/g compatible). Is this wrong? Thanks for anyone's help.