We had a recent power outage with our HiCom 150 and Office PhoneMail devices. The units are back up at this point and functioning, however, the PhoneMail now does not allow me to enable or disable any extensions. When I go into the Installation Options menu and try to enable or disable an extension, no matter what extension I put, the unit keeps saying "you have entered an invalid extension". All the previously setup extensions and mailboxes work fine however. What gives?