Public bug reported:

Unfortunately, every once in a while I still need to restart Unity - just now 
because I played with a setting (Window preview in Launcher) in Compiz and 
disabled it again.
In a situation where all window decorations, the Launcher, the top panel, etc. 
disappear I need to do "unity --reset" to get back...

BUT: after that, on my two-monitor-setup, the top panel clock, volume,
calendar, system menu - they all appear ONLY on the right monitor, not
on both as it does after a clean start of the system!

How can I get that back to work - apart from a clean boot?

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.24.0-0ubuntu2b1
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Ist ein Verzeichnis: 
'/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  285.05.09  Fri Sep 23 17:31:57 
PDT 2011
 GCC version:  gcc-Version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)
.tmp.unity.support.test.0:
 
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,imgpng,mousepoll,vpswitch,resize,move,grid,gnomecompat,obs,snap,place,wall,regex,animation,session,workarounds,expo,ezoom,staticswitcher,fade,scale,unityshell]
CompositorRunning: compiz
Date: Sat Nov 19 10:56:06 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 280.13, 3.0.0-12-generic, x86_64: installed
 nvidia-current, 280.13, 3.0.0-13-generic, x86_64: installed
 nvidia-current-updates, 285.05.09, 3.0.0-13-generic, x86_64: installed
 vboxhost, 4.1.6, 3.0.0-13-generic, x86_64: installed
GraphicsCard:
 nVidia Corporation GF108 [GeForce GT 555M] [10de:0dcd] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: Dell Device [1028:04b7]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
JockeyStatus:
 xorg:nvidia_current - Beschleunigter Grafiktreiber von NVIDIA (Proprietär, 
Deaktiviert, Nicht benutzt)
 xorg:nvidia_current_updates - NVIDIAs beschleunigte Grafiktreiber 
(Nachträgliche Aktualisierungen) (Proprietär, Aktiviert, In Benutzung)
MachineType: Dell Inc. Dell System XPS L702X
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-13-generic 
root=UUID=3042e369-71b6-4bf5-aa12-c9872225d48b ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/22/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A12
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 03RG89
dmi.board.vendor: Dell Inc.
dmi.board.version: FAB1
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: 
dmi:bvnDellInc.:bvrA12:bd07/22/2011:svnDellInc.:pnDellSystemXPSL702X:pvr:rvnDellInc.:rn03RG89:rvrFAB1:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System XPS L702X
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu6
version.ia32-libs: ia32-libs 20090808ubuntu26
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110411+8378443-1

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 oneiric running-unity ubuntu

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https://bugs.launchpad.net/bugs/892462

Title:
  After unity --reset, top panel is only shown on right monitor

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