There seems to be a problem with Cells for .NET version 5.1.1.0 deleting picture references in Excel 2007 files.
The problem does not seem to happen with Excel 2003 files, and it does not happen with older versions of Cells for .Net. (I've tried, for example, version 4.8.1.6, and the problem doesn't exist.)
I've attached a little program that merely opens the template.xlsx file and saves is at result.xlsx.On the PDF_PA worksheet, the picture reference to RTR!Print_Area is missing from result.xlsx.
Ann