This seems like two bugs:
1) Unity plugin mysteriously disabled, have to re-enable via ccsm
2) Launcher icon size can't be adjusted
I just experienced #1. The only thing I changed on the system between
working and broken login sessions was to install gparted (0.16.1-1),
which also installed libgtkmm-2.4-1c2a (>= 1:2.24.0)
I also found this in the syslog:
Feb 7 12:32:05 Arcturus gnome-session[1803]: WARNING: Child process 2057
was already dead.
Feb 7 12:32:05 Arcturus gnome-session[1803]: WARNING: Application
'compiz.desktop' killed by signal 9
Feb 7 12:32:05 Arcturus gnome-session[1803]: WARNING: App 'compiz.desktop'
respawning too quickly
Feb 7 12:32:05 Arcturus gnome-session[1803]: CRITICAL: We failed, but the
fail whale is dead. Sorry....
Kind of trouble-shooting in the dark here, but that's the best I've got.
Beyond that I don't know what could have caused it.
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https://bugs.launchpad.net/bugs/1212987
Title:
Unity not starting after boot
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