This is maybe 'cause you have a old version of PHP5, I has the same problem but I upgrade my version of PHP5 and I can change the admin password and create new users
http://serverfault.com/questions/694385/how-to-upgrade-php-5-4-to-php-5-6-on-debian-gnu-linux-7-wheezy
http://serverfault.com/questions/404815/how-can-i-upgrade-php-to-a-higher-version-for-debian-squeeze
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Answered: Account problem
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