PowerMac doesn't recognize AirPort Express

My PowerMac has recently stopped recognizing my AirPort Express. I have a PC/Mac network in my apartment with a WDS wireless bridge consisting of two AirPort Expresses. One is connected to the cable modem, the other to a hub in another room. The computer in question connects to the hub via ethernet. It does not have an AirPort card.
I've used this setup successfully for almost a year, with no problems until now. I have several other computers on this network (a PC connected via ethernet and a Mac laptop with wireless). They don't have any problems seeing the AirPort or using AirTunes.
While I still have internet access on the PowerMac through the AirPort Express wireless bridge, my Mac has quit recognizing it in the AirPort Admin Utility. iTunes also no longer shows my AirTunes speakers and iTunes sharing isn't working on this computer. iTunes sharing quit working first, then AirTunes a couple of days later.
I can access both AirPorts if I enter the IP address in the "Other" window in the AirPort Admin Utility. Using this I can change firmware settings and reset the AirPorts, but they still don't show up in the Admin Utility or in iTunes. Also, I can mount network drives from my other two computers (both wireless and ethernet), so basic network functionality seems OK.
I've installed all the most recent updates and I've played around with the IPv6 settings and UDP block option in the firewall. Nothing seems to make any difference. Any thoughts?
Message was edited by: John Asher

I believe I had a similar problem and found your instructions helpful without too much effort.
I've been in the 10.8.2 environment with no disruption to my wireless network until I choose to reconfigure it.
I'm using a Time Capsule as my primary wireless base station with a DSL modem directed into it. I then use an older Airport Express Base Station to extend the wireless network.
Upon reconfiguring the Time Capsule, Airport Utility 6.1 recognized it but not the Airport Express Base Station and the extended network was lost.
Using the workaround you described, I was able to obtain, unpackage and install airport utility 5.6 and then subsequently airport utility 5.6.1. Both recognized and maintained the configuration of my time capsule but neither version recognizes my older airport express base station. I did a factory default reset of the airport express base station a couple of times and rescanned using the airport utility 5.6.1 and it still does not recognize it.
My question is whether there is something beyond which version of airport utility and the airport express base station that might need adjusting. For example, anything to do with my time capsule configuration or other network settings?
Thanks.

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