Launcher icon title does not disappear automatically

When you hover over an icon in the launcher bar with the cursor, a text field with the title of the application pops up. Usually this disappears as soon as you move the cursor away from the icon. However, it occasionally happens that the title does not disappear, and stays on screen even though the launcher bar is hidden again (I have auto-hide turned on). If that happens, you can get the title to disappear as it should by hovering the mouse over the same icon again and then moving it away.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.2.2+14.04.20140714-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
NonfreeKernelModules: wl
.tmp.unity.support.test.0:

ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Sat Aug 2 18:33:50 2014
DistUpgraded: Fresh install
DistroCodename: trusty
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 6.30.223.141+bdcom, 3.13.0-24-generic, x86_64: installed
 bcmwl, 6.30.223.141+bdcom, 3.13.0-27-generic, x86_64: installed
 bcmwl, 6.30.223.141+bdcom, 3.13.0-29-generic, x86_64: installed
 bcmwl, 6.30.223.141+bdcom, 3.13.0-30-generic, x86_64: installed
 bcmwl, 6.30.223.141+bdcom, 3.13.0-32-generic, x86_64: installed
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0156] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:3977]
InstallationDate: Installed on 2014-04-23 (101 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: LENOVO 20245
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=e9acf7a8-4d74-4222-9079-5ec04553488a ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/28/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 7BCN36WW(V2.02)
dmi.board.asset.tag: No Asset Tag
dmi.board.name: INVALID
dmi.board.vendor: LENOVO
dmi.board.version: 00000000Not Defined
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo G500s
dmi.modalias: dmi:bvnLENOVO:bvr7BCN36WW(V2.02):bd08/28/2013:svnLENOVO:pn20245:pvrLenovoG500s:rvnLENOVO:rnINVALID:rvr00000000NotDefined:cvnLENOVO:ct10:cvrLenovoG500s:
dmi.product.name: 20245
dmi.product.version: Lenovo G500s
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 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.3-0ubuntu0.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.3-0ubuntu0.1
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 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Sat Aug 2 17:53:36 2014
xserver.configfile: default
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 18002
 vendor SDC
xserver.version: 2:1.15.1-0ubuntu2