Alt+Tab doesnt work if there are a lot of windows opened

[Joaquin]

I opened Nautilus, Chromium, Banshee, Empathy, Gwibber, PlayOnLinux, Gnome Terminal, Software Center, Virtualbox and Cheese and when I try to do alt+tab it doesnt work, it changes the window, but it doesnt show the switcher.
If I change the workspace, and do Alt+Tab the switcher appears showing all the running apps.

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 i686
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Es un directorio: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86 Kernel Module 280.13 Wed Jul 27 16:55:43 PDT 2011
 GCC version: gcc versión 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)
.tmp.unity.support.test.0:

ApportVersion: 1.23-0ubuntu2
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,grid,place,session,vpswitch,mousepoll,resize,obs,regex,move,imgpng,gnomecompat,wall,wobbly,animation,scale,expo,workarounds,ezoom,unityshell]
CompositorRunning: compiz
Date: Sun Oct 9 15:10:51 2011
DistUpgraded: Log time: 2011-08-06 20:34:16.741105
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 280.13, 3.0.0-12-generic, i686: installeddkms.conf: Error! No 'BUILT_MODULE_NAME' directive specified for record #0.
 Error! Bad conf file.
 File:
 does not represent a valid dkms.conf file.
GraphicsCard:
 nVidia Corporation GT218 [GeForce 210] [10de:0a65] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: XFX Pine Group Inc. Device [1682:2941]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
JockeyStatus:
 xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
 xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release updates) (Proprietary, Disabled, Not in use)
MachineType: ACER Aspire M5640/M3640
ProcEnviron:
 PATH=(custom, user)
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=78a6d886-effa-4cee-ab75-43e1b4f421b0 ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to oneiric on 2011-08-06 (63 days ago)
dmi.bios.date: 09/11/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: R01-B4
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: MCP73PV
dmi.board.vendor: ACER
dmi.board.version: NVIDIA MCP73
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR01-B4:bd09/11/2008:svnACER:pnAspireM5640/M3640:pvrR01-B4:rvnACER:rnMCP73PV:rvrNVIDIAMCP73:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: Aspire M5640/M3640
dmi.product.version: R01-B4
dmi.sys.vendor: ACER
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu3
version.libdrm2: libdrm2 2.4.26+git20110808.2acaf160-0ubuntu0sarvatt
version.libgl1-mesa-dri: libgl1-mesa-dri 7.12.0~git20110819.f23c3ebe-0ubuntu0sarvatt
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental 7.12.0~git20110819.f23c3ebe-0ubuntu0sarvatt
version.libgl1-mesa-glx: libgl1-mesa-glx 7.12.0~git20110819.f23c3ebe-0ubuntu0sarvatt
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+git20110819.64f237a4-0ubuntu0sarvatt
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.16.0+git20110819.d330f375-0ubuntu0sarvatt
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110823.169512fb-0ubuntu0sarvatt

[Launchpad Janitor (janitor)]

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

[Torsten Hilbrich (torsten-hilbrich)]

I noticed a similar problem with an amd64 install of oneiric. I currently have several application windows opened and have problems with the display of the window switcher.

If I invoke alt tab on a desktop with a window I can see that the switcher window is displayed behind the application window (I will add a screenshot showing this). On an empty desktop this display is naturally correct.

unity: 4.22.0-0ubuntu3
metacity: 1:2.34.1-1ubuntu4

01:05.0 VGA compatible controller: ATI Technologies Inc Radeon HD 3200 Graphics
[ 14.929] (II) Module radeon: vendor="X.Org Foundation"
[ 14.929] compiled for 1.10.2.902, module version = 6.14.99
[ 14.929] Module class: X.Org Video Driver
[ 14.929] ABI class: X.Org Video Driver, version 10.0

[Omer Akram (om26er)]

Thanks for the bug report. This particular bug has already been reported and is a duplicate of bug 859405, so is being marked as such. Any further discussion regarding the bug should occur in the other report. Feel free to report any other bugs you may find.