Hey dreamer, the problem may be the different url. The forum used to be at a subdomain:
forum.conductdisorders.com
now it's in a directory:
conductdisorders.com/forums
Webtv may not understand the redirect like a computer browser would. Please try using the url directly instead of the link and see if that fixes the problem.
There is also a new My Cookies setting down at the bottom of the page in the footer. Try expiring all of your cookies too.
Sorry for the inconvenience.