Unable to mount [device] Not Authorized

[Chris <bbshliu@gmail.com>]

Hi everyone,

Since I do a normal update, I can't mount my flash drive from
nautilus. It works before.
The error message is:

Unable to mount [device]
Not Authorized

But if I manually mount using "sudo mount ...", it works fine.

I found this post,
http://lists.debian.org/debian-user/2011/02/msg01022.html, but I can't
go back to the previous version of consolekit because of dependencies.
And I still don't understand the problem.
I'm using debian testing.
Could anyone provide any advice? Thanks.