Graphs aren’t displayed if you use Piwik Mobile 1.5 or earlier. Please update Piwik server to the latest version.If you still don’t see any graphs in Piwik Mobile ask your Administrator to open the Piwik “Plugin Management” page which can be found under settings. Make sure the “ImageGraph” is activated. Within the description of the plugin there is also a link to verify graphs are working. Just click the “Debug: All images” link. If graphs are not displayed there, the error is caused by your Piwik installation and not by Piwik Mobile. Make sure all required extensions, for example GD, are installed.