square in the left upper corner of the dash

[Benedikt Windolph]

every time i want to start a programm from the dash i see this square in the left upper corner, i think its a graphic glitch

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
Uname: Linux 3.15.0-031500-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3.2
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: Sat Jul 26 17:01:48 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 vboxhost, 4.3.14, 3.13.0-32-generic, x86_64: installed
 vboxhost, 4.3.14, 3.15.0-031500-generic, x86_64: installed
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:058b]
InstallationDate: Installed on 2014-05-31 (56 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: Dell Inc. XPS L322X
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.15.0-031500-generic root=UUID=11613522-e8b1-44ff-bf65-2c5ea7d100bd ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/28/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A10
dmi.board.name: 0PJHXN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA10:bd08/28/2013:svnDellInc.:pnXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: XPS L322X
dmi.sys.vendor: Dell Inc.
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+git1407160630.c0b34d~gd~t
version.libgl1-mesa-dri: libgl1-mesa-dri 10.3~git1407250730.cce581~gd~t
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.3~git1407250730.cce581~gd~t
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 1:7.4.99+git1407010730.c4ae0e~gd~t
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914+git1407241931.cac154~gd~t
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10+git1407030730.edd160~gd~t
xserver.bootTime: Sat Jul 26 16:32:14 2014
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 intel: Failed to load module "dri3" (module does not exist, 0)
 intel: Failed to load module "present" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 4933
 vendor CMN
xserver.version: 2:1.15.1-0ubuntu2