"Unity is made to work with Compiz but not with the desktop cube because
workspaces in Unity are different."

Roy that's why I went into the Ubuntu Classic before trying to use the cube. I
was suprised that making changes in Ubuntu Classic messed up Unity under the
default Ubuntu setting. I prefer Ubuntu Classic and my wife prefers Unity.

In my opinion using the Cube under the Ubuntu Classic session shouldn't mess up
Unity under the default Ubuntu (Unity) session. Maybe Canonical made a mistake.