unity appear and disapear very fast with evince in presentation mode and switching desktop

[Pato]

I put a pdf in presentation mode in evince and then switch to the right desktop. When coming back, unity appear and disappear very fast during the changing desktop picture.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: evince 3.4.0-0ubuntu1.4
ProcVersionSignature: Ubuntu 3.5.0-24.37~precise1-generic 3.5.7.4
Uname: Linux 3.5.0-24-generic x86_64
NonfreeKernelModules: nvidia wl
ApportVersion: 2.0.1-0ubuntu17.1
Architecture: amd64
Date: Thu Feb 21 12:44:43 2013
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213)
MarkForUpload: True
ProcEnviron:
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: evince
UpgradeStatus: No upgrade log present (probably fresh install)