"su -" claims bad password; logs show otherwise

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http://forums.fedoraforum.org – Howdy all; F17 i686 all updates applied. Good password for root; can log in at the terminal as root, and successfully log in using "ssh root@localhost" using password (disabled key in ~/.ssh/authorised_keys). "su -" results in "incorrect password" error. /var/log/secure reads, in part: Code: Sep 11 09:05:05 carriagehouse su: pam_unix(su-l:auth): authentication failure; logname=REDACTED uid=1000 euid=1000 tty=pts/0 ruser=REDACTED rhost=  user=root Sep 11 09:05:05 carriagehouse su: pam_succeed_if(su-l:auth): requirement "uid >= 1000 (HowTos)