gedit produces unexpected error messages

[Humphrey van Polanen Petel]

sometimes gedit gives error messages as follows
--
(gedit:6471): Gtk-CRITICAL **: gtk_tree_selection_get_selected: assertion `GTK_IS_TREE_SELECTION (selection)' failed

(gedit:6471): Gtk-WARNING **: Ignoring visual set on widget `gtk-tooltip' that is not on the correct screen.

--
this usually happens when I move the gedit window to the monitor I want it on

Note: I have a dual monitor system

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gedit 3.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
Uname: Linux 3.2.0-32-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu13
Architecture: amd64
Date: Tue Oct 16 15:53:53 2012
ExecutablePath: /usr/bin/gedit
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 TERM=xterm
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_AU.UTF-8
 LANGUAGE=en_AU:en
SourcePackage: gedit
UpgradeStatus: Upgraded to precise on 2012-05-01 (168 days ago)

[Launchpad Janitor (janitor)]

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