I think a lot of peoples’ ad-blocking extensions are blocking the message on the old forums telling them to come over here. I only saw it when I had turned off the extension temporarily for another reason and happened to go to the old forum for some reason.
With regards to the invites, I think that some might have had theirs go into their Spam or Junk folders in their respective email accounts. I didn’t know about my invite for a while because I hadn’t checked my Spam folder, so I wouldn’t be surprised if others had a similar issue.
Also, one thing I’ve noticed over the past day or two is that the thread title (as well as the search icon and the menu buttons to the left of your avatar) in the black header at the top of the page have changed color to a shade of grey that can make them difficult to read against the darker background. When you’re on the main forum page, the CBn header logo is visible just fine, but once you go into an actual thread, the titles become a bit more difficult to read due to the shade of grey that they are displayed in.