Can confirm that isn't the issue - the creds were saved prior to upgrading to the platinum package, which is when it stopped working. At the time I just figured it was either an issue with SXM or the C4 driver.. but after several weeks with it still not working tried logging out and into a different account with normal plan and it worked fine.
If the password is wrong it just says invalid username/password, if it's correct (on the platinum package) it says "Unexpected error" or something similar.