User registration error: I can't registrate a new customer on my page

[E.D.]

I have prestashop 1.4.

I cannot register any accounts.

I don't get:

 

- I open example.hu/authentication

- I type an email adress

- I click on the button

- The page is reload... (no error message!)

 

I compared the AuthController.php and the authentication.php the original files, but no difference...

 

Where I start the find one's bearings?

 

Please help!