The following code in our sandbox generates an empty graph: [[!graph src="""" google [ href="http://google.com/" ] sandbox [ href=\[[SandBox]] ] help [ href=\[[ikiwiki/formatting]] ] newpage [ href=\[[NewPage]] ] google -> sandbox -> help -> newpage -> help -> google; """"]] It is the exact same thing that on the [[ikiwiki/directive/graph/]] directive documentation, from the [[plugins/graphviz]] plugin. This is ikiwiki 3.20120203 on Debian wheezy and graphviz is installed (2.26.3-10). Note that the first demo actually works. See --[[anarcat]]