Comment 59 for bug 858845

This is a crude temporary work around.
Make a bash script

#!/bin/bash
setsid unity

Then add it to 'startup applications' so it runs automatically on startup
Rebooted and cold booted may be 20 times and have been working except maybe twice or three times where the session might be corrupted (show black borders when exposing workplaces instead of the orange high lighter) There may be a slight delay in login time but not obvious here.