I have this same problem this month where my login suddenly no longer works with ninjatrader7 sometime last week.
EDIT: Ok, email support got back to me and gave me a new id and login for the continuum feed with CQG. Still not working quite right where there is no realtime data working. But getting the login process back working with ninjatrader7 is resolved so far.
Can you help answer these questions from other members on futures io?