su to root denied?

[john Mish III]

I get this error message when I try to su to anything, either from root or 
to root, and I don't know why.
$ su
su: not running setuid

Is there a config file that should be set..or what. This is preventing me 
from starting up some applications, even as root!

ext57# /usr/local/etc/rc.d/mysql-server forcestart
Starting mysql.
su: not running setuid

Please help me as fast as you possibly can. Thanks!

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