Airport extreme freezes when updating MAC access list on WiFi. What can I do ?

Trying to add a new PC on the WiFi network, the control is via MAC addresses. I can enter the new MAC address, and description, but airport freezes when I try to update. The only way I can get back is unplug / replug airport, but then it is not updated with the new address.
Macpro on 10.7
Airport extreme 802.11n 1st gen (7.5.2 with airport utility 5.5.3)
Thanks

If you have not already done so, try temporarily connecting an Ethernet cable from your Mac to one of the LAN <-> ports on the AirPort Extreme. Then open AirPort Utility, make the changes you need and see if the AirPort Extreme will Update correctly. If it does, you can disconnect the Ethernet cable.
If still no luck, your next option is to perform a Factory Default Reset on the AirPort Exreme to clear out all the current settings and then reconfigure the device again.

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