The log file you're looking for here is ~/.cache/upstart/gnome-session.log. Please check for that and attach it to this bug.
Running "compiz --replace" from the terminal will not necessarily start Unity. You are better off running /usr/bin/unity to restart unity so the correct configuration will pick up the correct plugins. Please try that instead to see if the output differs.
The log file you're looking for here is ~/.cache/ upstart/ gnome-session. log. Please check for that and attach it to this bug.
Running "compiz --replace" from the terminal will not necessarily start Unity. You are better off running /usr/bin/unity to restart unity so the correct configuration will pick up the correct plugins. Please try that instead to see if the output differs.