I was trying to get the graph for crashers per ADU for a given time range. So I went to https://crash-stats.mozilla.com/daily?p=Firefox&v= and edited the starting date field. When I submitted the results the page said: "No Active Daily User crash data is available for this report." When I tried again later, with that same date range, the page came back with the graph I expected. When I tried editing the date with a different date range, nothing showed. However, trying again a minute later would display the expected graph. I think I can get it to reproduce by changing to a date I haven't submitted before.