Any chance of posting a packaged workbook or link to the visualization so we can check it out?
Thanks for asking. Here is a link to a copy of the viz (I changed the original so the error doesn't show). Where the title bar says "Summary Stats for None" is should say Summary Stats for 2009" (or whatever year you choose). It used to work just fine and stopped working recently although I had not changed the viz in months.
2009 is not appearing in the title because all of the data for 2009 is hidden. By making a duplicate of Year and placing it on the Level of Detail shelf, then replacing <Year> in the title with this duplicate of Year field, 2009 will appear in the title.
Thank you. That worked.