I went to update my old SensorPanel design. I the process, I deleted my old graph of current download rate and tried to setup a new one with my new defaults.
If I create a graph, it doesn't show any network rate information on the item list - I only get connection rate and total download. If I do a simple sensor item, it shows up as a selection.
So, I went into Notepad++ in the old exported sensorpanel file that had a working download rate graph, and cut and pasted the graph line for download rate into the new sensorpanel file and the graph shows up correctly in the panel.