Application menu is still visible when screen is locked

[sviola]

Ubuntu Release: 11.10

Version of gnome-screensaver: 3.2.0-0ubuntu1

What I expected to happen:
The lock screen should be displayed with only the window to enter the password.

What happened instead:
The lock screen is displayed properly, but the application menu is still visible. (see attached photo)

I'm not sure if this is filed under the correct package. Please change it if it's not.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gnome-screensaver 3.2.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
Uname: Linux 3.0.0-17-generic x86_64
NonfreeKernelModules: fglrx wl
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Tue Apr 3 20:02:16 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-screensaver
UpgradeStatus: No upgrade log present (probably fresh install)