Set up of OpenDNS through a CAX80 Nighthawk router

Yesterday I updated the DNS settings in the Nighthawk Browser interface to redirect DNS from Cox to OpenDNSand it all looked good and for awhile yesterday - when I clicked on the link within the OpenDNS set up to test if it was working it was.  Then it stopped working and I have been unable to reestablish connectivity to OpenDNS.  All the settings look correct and I have flushed the browser cache and flushed DNS from a command line.  I have also turned off Armor security and that did not work.  Any other suggestions?