IFAIK compiz can manage workspaces (like metacity) and viewport. If the pager show only a gray rectangle, viewports are enabled (and you should have the cube) but in this case you can't do things like move windows between viewports.
IFAIK compiz can manage workspaces (like metacity) and viewport. If the pager show only a gray rectangle, viewports are enabled (and you should have the cube) but in this case you can't do things like move windows between viewports.