New Users Role

Hello,

I want to set new users role to subscriber but its not working on Settings->General Default users role.I’ve changed it but when i reload page this option will get back.
But when i changed users role from Users page, it works.

Another trouble,
I want to block .com/wp-admin or /wp-user pages for registered users, except Administrators.

Thanks.

Edit:Current default role can submit and edit posts >.<