Found the problem. A process called cairo-dock-unity-bridge is causing the gap. If I kill this process the gap disappears. Not sure why this runs when I start cairo-dock; as I said I'm using Gnome2. In preferences Gnome Integration is enabled; I don't see any options to disable Unity integration. Is there a quick fix to keep this process from starting with cairo-dock?
Found the problem. A process called cairo-dock- unity-bridge is causing the gap. If I kill this process the gap disappears. Not sure why this runs when I start cairo-dock; as I said I'm using Gnome2. In preferences Gnome Integration is enabled; I don't see any options to disable Unity integration. Is there a quick fix to keep this process from starting with cairo-dock?