Somebody in the thread at some point said:
I have F7 (fresh install in late June) on a Dell Latitude D610.
Just a few days ago, I stopped being able to 'su' or 'su some_user'
from a terminal: the passwords are no longer accepted. Same problem
to unlock a session (need to enter the password).
Is su still suid root?
# ls -l /bin/su
-rwsr-xr-x 1 root root 27052 2007-04-02 16:33 /bin/su
-Andy