Turn hub off in modem mode for 2 mins have your router connected to the right port and turn hub back on.
------Die-hard direct connection modem user---Believing is catch 22 the Super hubs 1, 2 & 3 could have been built better the years go by and we can't see the mistakes that were made to make things right. Use modem mode If I could offer you only one tip for the future, modem mode would be it. BQM, Outgoing ports test
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I think this one got me too but I found another solution. For convenience I was plugging my PC into port 1 (first ethernet port) to do the reconfiguration then switching for my router once the hub had re-booted into modem mode and I'd checked this with the PC. This allows the PC time to get an internet address but also to register it's MAC address on the link. When I re-plugged the router it was being rejected as Virgin don't allow more than one device to direct attach.
My solution was to plug the router into port 1 and use one of the other ports to switch the hub to modem mode. Once it switches this connection is dead so you can only check configuration via the colour of the logo. When it re-boots the only device it sees is the router so this time it works.