Cannot make sudoers change work

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http://www.unix.com – I logged in as root and visudo'd /etc/sudoers. I found several users with the username ALL=(ALL) ALL entries and added an account after the last one. Saved the file. When the user logs in and does "sudo su -" they are prompted for their password and then told they are not in the sudoers file. Is there another step to "activate" the change?:confused: (HowTos)