I do, it's a NA unit using NA FW, v2.07 so not sure if loading your config file would work. Worth a try though if you want me to.
I've asked one of our resident IPv6 experts to review this to see if there could be an issue.
So if you configure the router for everything, accept IPv6 tunnel broker, save the config to file, can you access the pages? Trying to help you narrow this down as much as possible.