in version 6 the graph showed up automatically on my desktop after each reboot. now with version 7 the graph only shows up when i go to the settings page and select the graph. but on reboot it is gone again. how can i fix it? or do i need to go back to version 6?
You certainly don't need to go back to version 6 for that.
Simply click the Star button on the graph toolbar. This will make the graph to show up automatically next time your computer starts.