Version:            (using KDE KDE 3.2.2)
Installed from:    Compiled From Sources
Compiler:          gcc 3.3.3 
OS:                Linux

As of KDE 3.2.2, kdesu does not want to log in as root.
It says "Invalid password", even if the password is the
right one.

It finds and start su, but it simply does not work.
If I start it from konsole (for instance,
"kdesu kcmshell k3bsetup2"), I get :

kdesu (kdelibs): [process.cpp:263] Running `/bin/su'
kdesu (kdelibs): [su.cpp:180] Read line <Password: >
kdesu (kdelibs): [process.cpp:263] Running `/bin/su'
kdesu (kdelibs): [su.cpp:180] Read line <Password: >
kdesu (kdelibs): [process.cpp:350] Child pid 19006
kdesu (kdelibs): [su.cpp:180] Read line <>
kdesu (kdelibs): [su.cpp:180] Read line <-c: -c: No such file or directory>

(please note the double "-c:", quite strange).

It therefore appears the environment for su is not set up
correctly (especially the PATH). My /etc/profile did adds
/opt/kde/bin to the PATH envar. My /etc/logins.def also does.
It doesn't work even for konsole / bash 
(kdesu /opt/kde/bin/konsole for instance)
Didn't manage to get it work, anyway, the error message is wrong
(the password is right). Maybe the command line used to start
su is wrong also.

CC