Comment 103 for bug 1158267

in my case this bug repeated three times:
 one after upgrade 12.04 - 12.10 - 13.04, in May 2013
 second - after clean install on the same PC, in Sept. 2013
 third - after clean install on other PC with different configuration, today

today bug shows only after these commands and reboot: apt-get upgrade && sudo apt-get install bleachbit synaptic vlc cairo-dock