ion_auth is not correctly working

[eluser]Vlad111222[/eluser]
when I set up russian language in config file in codeigniter - I can not log in
when I set up english language in config file in codeigniter after registration new user, this user can not log in if entered data about user was not in english (error message - Incorrect Login). if data about user is in english - user can log in fluently. Can somebody help me?
I used this video for integration ion_auth in codeigniter
http://www.youtube.com/watch?v=w1UYr6Ulyxs
maybe I not correctly integrated ion_auth in codeigniter please help me!