After update, Cairo-dock fails to run; complains about no plugins found

[fbyoung]

lsb_release -rd
Description: Ubuntu precise (development branch)
Release: 12.04
$ apt-cache policy cairo-dock
cairo-dock:
  Installed: 3.0.0.1-0ubuntu1
  Candidate: 3.0.0.1-0ubuntu1
  Version table:
 *** 3.0.0.1-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ precise/universe i386 Packages
        100 /var/lib/dpkg/status

Cairo dock complains about missing plugins, exits.

dpkg -l |egrep cairo-dock
ii cairo-dock 3.0.0.1-0ubuntu1 Light and eye-candy dock to launch your programs (metapackage)
ii cairo-dock-core 3.0.0.1-0ubuntu1 Light and eye-candy dock to launch your programs (core package)
ii cairo-dock-data 3.0.0.1-0ubuntu1 Light and eye-candy dock to launch your programs (common files)
ii cairo-dock-plug-ins 3.0.0.0rc1-0ubuntu1 Set of plug-ins for Cairo-Dock
ii cairo-dock-plug-ins-data 3.0.0.0rc1-0ubuntu1 Common files for cairo-dock-plug-ins
ii cairo-dock-plug-ins-dbus-interface-python 3.0.0.0rc1-0ubuntu1 Python interface to interact with Cairo-Dock by using DBus
ii cairo-dock-plug-ins-integration 3.0.0.0rc1-0ubuntu1 Plug-ins for Cairo-Dock for a better integration in GNOME, KDE and Xfce

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: cairo-dock 3.0.0.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic-pae 3.2.14
Uname: Linux 3.2.0-23-generic-pae i686
ApportVersion: 2.0.1-0ubuntu4
Architecture: i386
CompositingMetacity: false
Date: Tue Apr 17 18:30:14 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120328)
PackageArchitecture: all
PciDisplay: 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GSE Express Integrated Graphics Controller [8086:27ae] (rev 03) (prog-if 00 [VGA controller])
RelatedPackageVersions:
 xserver-xorg 1:7.6+12ubuntu1
 libgl1-mesa-glx 8.0.2-0ubuntu3
 libdrm2 2.4.32-1ubuntu1
 xserver-xorg-video-intel 2:2.17.0-1ubuntu4
 xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
SourcePackage: cairo-dock
UpgradeStatus: No upgrade log present (probably fresh install)
WM: No value set for `/desktop/gnome/applications/window_manager/current'
glxinfo: Error: [Errno 2] No such file or directory
system: distro = Ubuntu, architecture = i686, kernel = 3.2.0-23-generic-pae

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.