With the graph not saying "No data to display" that would indicate that there are numbers being recorded, however; depending on what the response time is on a ping, the values may be getting rounded down to 0 showing what appears to be a blank chart. If you look at the data from the chart, what are the values?
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When you ping these devices, what sort of response time are you getting? If it's always <1, then the chart will look like it's recording nothing.