top bar still visible when screen is locked

[jtlb]

When screen is locked, the top bar is still visible. I'm pretty sure it wasn't before.
This behavior occurs in Unity 3D. I did not notice it in the 2D version.

In my opinion, this is a bit annoying because the title of the last used application is still visible and this may be sensitive. All the indicators are also displayed but hopefully not clicable.

Not sure whether it's a 'security vulnerability' though

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+12ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-4.4-generic 3.5.0-rc6
Uname: Linux 3.5.0-4-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] est un dossier: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 302.17 Tue Jun 12 16:03:22 PDT 2012
 GCC version: gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
.proc.driver.nvidia.warnings.fbdev:
 Your system is not currently configured to drive a VGA console
 on the primary VGA device. The NVIDIA Linux graphics driver
 requires the use of a text-mode VGA console. Use of other console
 drivers including, but not limited to, vesafb, may result in
 corruption and stability problems, and is not supported.
.tmp.unity.support.test.0:

ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
Date: Thu Jul 12 15:17:45 2012
DistUpgraded: Fresh install
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 302.17, 3.5.0-3-generic, x86_64: installed
 nvidia-current, 302.17, 3.5.0-4-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 NVIDIA Corporation NV44 [Quadro NVS 285] [10de:0165] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: NVIDIA Corporation Device [10de:0334]
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MachineType: Dell Inc. Precision WorkStation T3400
ProcEnviron:
 LANGUAGE=fr_CA:fr
 PATH=(custom, no user)
 LANG=fr_CA.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-4-generic root=UUID=9ecca4aa-bcaa-4f51-9f9b-8b22cee94ddc ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/14/2008
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A08
dmi.board.name: 0TP412
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA08:bd08/14/2008:svnDellInc.:pnPrecisionWorkStationT3400:pvr:rvnDellInc.:rn0TP412:rvr:cvnDellInc.:ct7:cvr:
dmi.product.name: Precision WorkStation T3400
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.7.8-0ubuntu1.2
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.37+git20120711.881e69f1-0ubuntu0ricotz~precise
version.libgl1-mesa-dri: libgl1-mesa-dri 8.1~git20120711.f9b3e257-0ubuntu0sarvatt4~precise
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.1~git20120711.f9b3e257-0ubuntu0sarvatt4~precise
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.12.3+git20120709+server-1.12-branch.60e0d205-0ubuntu0ricotz~precise
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0+git20120504.f28507e8-0ubuntu0sarvatt~precise
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.99.99+git20120711.ef8a4043-0ubuntu0sarvatt~precise
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.19.0+git20120711.b5db90aa-0ubuntu0sarvatt~precise
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A