Comment 2 for bug 598647

Could you please generate an apport crash report for this? A crash report will help in resolving your problem.
You can enable apport for one instance like this in the terminal:
sudo service apport start force_start=1

You may find it helpful to read https://wiki.ubuntu.com/Apport if you're having trouble creating a crash report. I am marking this invalid as apport will open a new bug when the crash is generated. Please include any relevant information from this report in the new bug report. If you cannot generate a crash report, you can reset the status of this one to new and we will try something else. Feel free to subscribe me to the new bug report so I can assist you further.