Suddenly my chart fails to update. When I add a row to the bottom of the table, the lines in the chart do not reflect that addition. I've tried a lot of things but I can't get the added row(s) to show up in the chart. I've compared the chart to other charts that do not have the problem and I can't find any differences.

In the chart, the X values are dates and the Y values are blood pressure readings.

I've been updating this chart twice a month since 2006 and I don't know why the lines in the chart have stopped reflecting values in the added row in the table. I have many other charts in other Excel files that do not have this problem. It's only a problem either with this one specific chart or with this one specific Excel file. Can somebody please help me out here?

Thanks,
Skeezix