Account Log in on N360

N360 asked me to login this morning.  I couldn't remember my password (it's in the vault!) so I changed the password at the Norton website.  But N360 won't let me log in using the new password, refuses to recognize it.  I changed the password again and still can't log in via N360 - although the new password works fine at the Norton website.  I shut down my PC (Windows 8.1), came back to it an hour later, and still can't log in to my account via N360.  I need my vault - what am I to do? How can I get in to my Norton account via N360 if it won't recognize my password.