I'm having the same issue as the person in post #11. If I get the error message and then shift+tab over, I change my name and passowrd to the correct ones, and I get a message that says:
"Your Impulse account does not have access to this title. If you have a serial number, please register it in Impulse."
But it IS registered and stored in Impulse.
What do I need to do? I have tried changing account names, passwords...nothing works!