Yep. That's what fixed it to me. I re-emerged my *dm and it started working.
In my case: gdm.

On 1/22/08, Etaoin Shrdlu <shrdlu@unlimitedmail.org> wrote:
>
> On Saturday 19 January 2008, Ricardo Saffi Marques wrote:
>
> > I went through something similar once. KDE informed me there was no
> > greeter configured. So it simply refused to lock the session. I then
> > did something about gdm (yep, even though I use KDE I prefer gdm) and
> > it started working.
>
> When I got the no greeter message, reemerging kdm fixed the issue.
> --
> gentoo-user@lists.gentoo.org mailing list
>
>


-- 
Ricardo Saffi Marques
Laboratório de Administração e Segurança de Sistemas (LAS/IC)
Universidade Estadual de Campinas (UNICAMP)
Cell: +55 (19) 8128-0435
Skype: ricardo_saffi_marques
Website: http://www.rsaffi.com