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It means that you are not running an update agent which updates OpenDNS with your current IP address. Either that, or the update agent is not working.
Take a look at your broadband IP address on the home hub, and see if it matches your public IP address as shown on the OpenDNS dashboard on their website.
Also visit this page and see if it says you are using OpenDNS.
Did you simply de-activate BTs controls, or uninstall them?
De-activating them still leaves the DNS redirection in place, so you need to use the uninstall option. It can take a few hours for it to take effect.
Perhaps the updater agent is being blocked from accessing the OpenDNS server? Try a different updater like Marcs Updater, which I have used.
The normal updater does use a special API, and an odd port number, as I discovered when I forgot to open a port on my outgoing home hub 1 firewall, which is user controlled, unlike the later home hubs.
Also, have you tried forcing the updater to update your IP address
Have you restarted the home hub to force an IP address change so that the routing avoids the DNS intercept, and to clear the hubs DNS cache, and then restarted your PC?
There may be more solutions on the OpenDNS forums.