All graphs on dashboard portlet, except Dial Graphs, work properly. Why?

All graphs on dashboard portlet, except Dial Graphs, work properly. Why?

Ensure that the 'AngularGuage.swf' file is present under 'Tomcat\webapps\ARC\Flash\fusion' path. If not, the Dial Graphs will not show up on the dashboard portlets. Note that this is advanced configuration, please check with support team if this is the behavior.