Can't do ALL administration tasks through VNC?

[Gilles Gravier]

Hi!

So I've installed Hardy... VERY nice.

But I have one strange behavior (maybe it's expected - how do I change 
it?)...

While I can run Administration->Users and Groups from the console GNOME 
session and then properly press "Unlock" to get the rights to change 
things there... if I do this from a VNC session from remote, "Unlock" is 
greyed out, and effectively, I can't change users... Same thing for 
configuring shares... and other things.

My guess is that somehow Ubuntu thinks that a VNC session is unsafe. But 
I think otherwise (I tunnel my VNC through SSH)... so I'd like to enable 
full administration regardless of where my GNOME session is connected from.

Any idea?

Thanks,
Gilles.