brasero intermittently fails to appear on desktop when activated via nautilus context menu

Steps to reproduce:

1. In nautilus right-click on an .iso file and select "open with brasero disc burner"
2. If the brasero dialog appears, then click "cancel".
3. repeat step 1.

Expected behaviour: Brasero dialog appears

Actual behaviour: nothing appears

pgrep -l brasero shows that a brasero process is running. If you kill that process, you are then able to get to the brasero dialog by selecting the option from the context menu.

Note: I first noticed this the very first time I right-click selected brasero - nothing appeared and there was no feedback. Also, when this happens, attempting to start brasero from the Dash also results in nothing happening, no feedback.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: brasero 3.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.39-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Wed Jun 6 20:53:26 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: brasero
UpgradeStatus: No upgrade log present (probably fresh install)