gedit starts new instance although it is already running

[Saddy]

How to reproduce:
1) open gedit via unity launcher
2) open a txt file via nautilus

-> now you have got 2 gedit instances

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: nautilus 1:3.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Thu May 3 17:43:29 2012
GsettingsChanges:
 org.gnome.nautilus.window-state geometry '939x628+1908+134'
 org.gnome.nautilus.window-state sidebar-width 291
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120420)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: No upgrade log present (probably fresh install)