Video Tutorials Missing Many Domains

On the Integrated Video Tutorials screen (, many of our previously entered sites are missing from the list. It's also missing our core domain for our multi-site hosting. When I try to add this domain back ( it says "That domain is already registed by you or another user! Contact support for help.". We only have one account with you. By this not being assigned, this broke all our subdomain sites. How did this change? And who is that domain assigned to?