I'm running qa0328

Some of the control center apps require root privilege, and nicely offer to
su to root for you when you try to run them.  However, they don't update
the path to reflect the path needed for root, and this sometimes breaks the
app.

For example, under System there's a Boot Manager tool which edits the Lilo
config.  As an ordinary user, I don't have /sbin in my path.  When I try to
run Boot Manager, it prompts me for the root password and then launches
Boot Manager as root.  However, it uses my non-privileged user path when
doing so, so it runs without having /sbin in its path.  Consequently, it
can't find /sbin/lilo and so it fails to work (and reports a cryptic error
about invalid configuration).

All the su to root KDE apps should make sure that they define an
environmental PATH which includes /sbin and /usr/sbin if they're not
already there to avoid these sorts of issues.