have you got two emails listed with NetAcad. I had this problem when I tried to combine two different Cisco emails.
I have to use two different browsers one for netacad login and one for cisco login.
Have you gone to the help part of Netacad here is relevant part
There are worlds out there where the sky is burning, where the sea's asleep and the rivers dream, people made of smoke and cities made of song. Somewhere there's danger, somewhere there's injustice and somewhere else the tea is getting cold" Dr Who
