Airport Extreme 7.2.1 - Can't get wireless working

I upgraded my AEBS to 7.2.1 yesterday from my MB and immediately wasn't able to reconnect to the BS after the upgrade, not even to configure or view logs. I plugged into the lan port, and was able reset the device to factory settings, and then I reconfigured it - it seemed to work fine from the LAN port, was doing routing/NAT fine, etc. After it came back on, with a green light, I still wasn't able to see its signal from ANY of my macs (two MBs, one iMac.) I even tried from a freshly installed OS X on the imac, and nada. Nothing could find my AEBS signal.
I downgraded to 7.1.1 and everything works fine. 7.2.1 seems honked.
I'd like to run the newest software, but obviously the wireless connectivity is important. Any ideas?

Hello Terry D.!
Thank you SO MUCH for the information. It cleared us right up, and it made the sweeter because of the six or so hours trying to fix this last night. I sure hope that Apple is going to fix this firmware update.
I might add one thing -- I looked for a dropdown box labeled "Version" and could ot find one. It took a minute or two to figure out to click on the word "Version" in the list of settings.
Thanks again!!
Sallie Fallie

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