Some programs get two arrows in the launcher for one instance

[Jendrik Seipp]

Although there's only one instance of e.g. uxterm running, it gets two arrows on its left side in the launcher (see picture).

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.2.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-14.23-generic 3.2.3
Uname: Linux 3.2.0-14-generic x86_64
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,compiztoolbox,resize,imgpng,zoom,mousepoll,regex,snap,place,move,gnomecompat,wall,vpswitch,grid,session,animation,workarounds,expo,ezoom,staticswitcher,fade,scale,unityshell]
Date: Wed Feb 8 22:21:03 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111129.1)
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)