I followed the instructions involving metacity --replace, and the result was that the Unity sidebar disappeared. After a moment of panic I shut down the computer and hit the restart option.
When Ubuntu came back up, I called up the Terminal and the border was back.
I just wanted to throw this in as my experience. Yes, metacity worked, but it wasn't simple, it required a restart of the computer. Or was that something a more computer-knowledgeable person would have known?