superuser password no longer works!

[Darrell Thomas]

I just downloaded all the security updates for my mandrake linux 10.0
box.
 
--now the su password will not work.  I can still logout and back in as
"ROOT", so I have access, but the passwords should be the same (like
they were before the patch)
 
address@hidden Darrell]$   su
Password:                                             (I enter the
correct password)
Su: incorrect password
 
 
I have to log out and relog back in to get to the ROOT directory. 
 
Any words?