In my case it seems to be a network settings problem.
in my /etc/network/interfaces the lo device is configured as:
auto lo
after system startup the lo device is not alive. Starting gnome gives the well
known white box in the left bottom corner.
After
sudo ifconfig lo up
in the base terminal gnome starting up without any problem.
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gnome-settings-daemon crashes at login
https://launchpad.net/bugs/61381
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