can't mount disks without entering password

[karl anliot]

Running a daily build of Lubuntu precise, I'm trying to mount my disks with pcmanfm, but instead of just mounting them, it's needing my password now.
not really sure if this is intentional or not.

to reproduce, also have a usb disk inserted. but it doesn't need a password to mount the usb flash drive

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: policykit-desktop-privileges (not installed)
ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11
Uname: Linux 3.2.0-19-generic x86_64
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Mon Mar 19 18:54:38 2012
InstallationMedia: Lubuntu 12.04 "Precise Pangolin" - Alpha amd64+mac (20120316)
ProcEnviron:
 TERM=xterm
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: policykit-desktop-privileges
UpgradeStatus: No upgrade log present (probably fresh install)