Libre office calc icon not showing in Launcher properly

[Subhadip Ghosh]

1) Log in to Ubuntu with Unity 3D.
2) Open a LibreOffice Calc file(.ods).
3) The LO Calc icon is sometimes not displayed on the Launcher, instead an empty space is displayed(refer to the attached screenshot). Sometimes, the icon is present, but there is an empty space on the launcher just above the Calc icon.

Additional Information: I logged in to Unity 2D for a brief period to check if the issue occurs there also, but it worked fine there.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.12-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic-pae 3.2.19
Uname: Linux 3.2.0-26-generic-pae i686
ApportVersion: 2.0.1-0ubuntu8
Architecture: i386
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]
Date: Sun Jul 15 01:04:42 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
ProcEnviron:
 LANGUAGE=en_IN:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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