Airport express no longer recognized by macs, but still seen by iOS

Hello,
I have two airport expresses that I've been using just for streaming audio to two stereo amplifiers.  They were working fine a week ago, both with Lion and with Snow Leopard.  I have five macs in the house right now, running either of those OS versions.  All have suddenly refused to recognize my two airport expresses.  I can't find them using Airport Utility 5.6.1, which I think was recently provided by software update, so I downloaded an earlier version and it doesn't see them, either. 
I have made a few changes recently, but none in the last week when the problem has started.  A couple of weeks ago I went to a Vizio wireless router, because the airport express that I had been using for my wifi internet had begun to drop its connection.  About 10 days ago I downgraded back to Snow Leopard because my white macbook was not performing well with Lion.  But after doing so, the airport expresses were working fine in conjunction with the new router. Another computer running Snow leopard also refuses to recognize either Airport express, and there's been nothing done with that except to upgrade Airport Utility to 5.6.1.  The macs in the house running Lion have Airport Utility 6.0, and they can't find the airport expresses either.
I have tried rebooting computers, and unplugging/reconnecting the airport expresses.
So you might think the problem lies with the Airport Expresses, but why would they both fail at the same time?  And to add to the mystery, I find that my iOS 5.1.1 devices, including an ipad 2 and an iphone, both can recognize either of the AEs. 
Thanks in advance!

Ok, found a solution.  the wireless router sets up two networks, one at 5 ghz and the other at 2.4 ghz.  I had been connected to the 5 ghz network.  When I switched over to the 2.4 ghz connection, the Airport expresses became visible again.  So, I guess the airport card sets its speed to receive the wifi network and as long as it's using that, can't communicate at a different rate for other devices?

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