individual conversation graphs not working

individual conversation graphs not working

Please see the attached screenshots.  If I try to view a graph of an individual conversation, the graph doesn't show the lines for the data.  Exporting to a pdf also doesn't show the actual line on the graph.  The Main graph regarding all flows on an interfaces shows correctly, but when you drill down and find a user that is using a large amount of data, you can't generate a report on it.

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