
Okay so i tested that out aaaaaaanndddd, It does actually the same thing that i do by just starting a new dock. Maybe i am closing it wrong but i do this.
In the system monitor i close Cairo dock (checked if itś gone) then open the terminal and type cairo-dock & that will run like 2 docks at the same time and only one of them can configure. i also see a lot of red warnings in the terminal.
I can´t find system manager so i suppose you meant system monitor?