Public bug reported:

Sometimes when switching back to a workspace which contains an
application that was in focus previously, the application is not
visible. For example, sometimes when using Firefox in one workspace, and
then switching from this workspace and back, the firefox application
will not be visible. Either applications that are also running in the
same workspace are visible or just the wallpaper. The application is
still running. It is necessary to select the application from the left-
hand application bar/launcher to make it visible again. I can also add
that the application is still visible in the indicator that is opened
when I switch workspaces with CTRL+ALT+"arrow keys".

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.22.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 1.23-0ubuntu3
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,decor,compiztoolbox,place,move,grid,vpswitch,imgpng,ring,mousepoll,regex,snap,resize,gnomecompat,session,unitymtgrabhandles,animation,expo,wall,workarounds,ezoom,fade,scale,unityshell]
CompositorRunning: compiz
Date: Mon Oct 24 12:31:52 2011
DistUpgraded: Log time: 2011-10-14 17:17:03.050443
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
 blcr, 0.8.2: added
 virtualbox, 4.1.2, 2.6.38-11-generic, x86_64: installed
 virtualbox, 4.1.2, 3.0.0-12-generic, x86_64: installed
GraphicsCard:
 Intel Corporation 82945G/GZ Integrated Graphics Controller [8086:2772] (rev 
02) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:01ad]
   Subsystem: Dell Device [1028:01ad]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: Dell Inc. OptiPlex GX620
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=sv_SE.UTF-8
 LC_MESSAGES=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic 
root=UUID=2ab8ed04-99b9-4714-885a-b4b3d5f06c57 ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to oneiric on 2011-10-17 (7 days ago)
dmi.bios.date: 11/30/2006
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A11
dmi.board.name: 0F8101
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 15
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA11:bd11/30/2006:svnDellInc.:pnOptiPlexGX620:pvr:rvnDellInc.:rn0F8101:rvr:cvnDellInc.:ct15:cvr:
dmi.product.name: OptiPlex GX620
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu5
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.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
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 regression-update running-unity 
ubuntu

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https://bugs.launchpad.net/bugs/880775

Title:
  After switching back to a workspace, the therein previously active
  application is sometimes not visible

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