I have the arc theme installed and the numix circle icon pack. Sometimes, when I boot up the system, the desktop looks like this (note also how bad the text looks):
However, if I do from the terminal
sudo service lightdm restart, everything is normal as expected:
This didn't happen some days ago, maybe it's something I installed. This also happened sporadically on 14.04, but now is more frequent.
How can I solve this, or at least how can I try to figure out what's wrong?