Synss, it didn't help me...
In what way? Does one of the steps I propose fail? Are you still unable to shut down? You are not helping me helping you!:/
I patched ConsoleKit your way, but I still have dialog box asking for my root password when I go to shutdown. Also I seem to be logged in twice when I do $who command.
Ah, sorry… If you had no problems patching and installing the patched version, I cannot really help you. All I can say is that it works for me. Sorry again.