Continuum 1.1 won't authenticate a new issued user

When I create, as administrator, a new user and give him roles, if I logout and then login back with the fresh created user I cannot access continuum, because it complains that user/password are incorrect. I try then to create a less powerful user, because I've read that in the past there was an issue related to authentication and user profiles, but nothing, I then decided to open the issue.

application log attached.