Some applications icons are missing in Unity 2D Dash and Launcher

[Nicola Jelmorini]

I have installed two applications: Recoll and Dconf Editor. When I use the Unity 2D session, the icons of these applications are missing. There is only a gray icon with a question mark.
Strangely, when I use the Unity 3D session, this problem don't happens.

I have attached to this bug report a couple of screenshots to show you the issue.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity-2d 5.8.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-21.34-generic 3.2.13
Uname: Linux 3.2.0-21-generic x86_64
ApportVersion: 2.0-0ubuntu2
Architecture: amd64
Date: Sat Mar 31 13:18:16 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111215)
PackageArchitecture: all
SourcePackage: unity-2d
UpgradeStatus: No upgrade log present (probably fresh install)

[ignasi (igp-oenus)]

I'm on Precise final and still this bug affects me too.

[Launchpad Janitor (janitor)]

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