Yes, I meant Graph By Date. The alternative graph does show downloads in December.
On the Graph By date picture the dates shown by tick marks on the horizontal axis begin with 09/06/10 and end with 11/29. The 10 for the year in 11/29/10 does not show as the graph picture is cut off at this point. Neither are the following Mondays in December – 12/06/10 and 12/13/10. It seems to me that the graph should show them with the data lines tracking from day to day as is done for all the other weeks. Therefore, I am still of the opinion that this is a bug in the way the picture is generated.