App prewiev shadow in App Switcher is getting wider

[Fpfilko]

In App Switcher (ALT+TAB) shadow of preview window is getting wider by the time. It looks, that new shadow is created but the old one is not deleted. You can see it in screeshots

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Mon Aug 11 14:09:56 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 i915-3.15-3.13, 0.01, 3.13.0-24-generic, x86_64: installed
 i915-3.15-3.13, 0.01, 3.13.0-30-generic, x86_64: installed
 i915-3.15-3.13, 0.01, 3.13.0-32-generic, x86_64: installed
EcryptfsInUse: Yes
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0106] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:3977]
InstallationDate: Installed on 2014-04-17 (115 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: LENOVO ChiefRiver Platform
PackageArchitecture: all
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=995cb0d9-0793-489c-a5b9-6ace96d4cc17 ro acpi_backlight=vendor
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/23/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 62CN91WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Lenovo G580
dmi.board.vendor: LENOVO
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo G580
dmi.modalias: dmi:bvnLENOVO:bvr62CN91WW:bd10/23/2012:svnLENOVO:pnChiefRiverPlatform:pvrLenovoG580:rvnLENOVO:rnLenovoG580:rvr:cvnLENOVO:ct10:cvrLenovoG580:
dmi.product.name: ChiefRiver Platform
dmi.product.version: Lenovo G580
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.11.2+14.04.20140714-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.54-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.2.2-0intel1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.2.2-0intel1
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.911-0intel1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Mon Aug 11 13:40:32 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 16978
 vendor SEC
xserver.version: 2:1.15.1-0ubuntu2

[Launchpad Janitor (janitor)]

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