New Post: Empty cell values

I've used ExcelDataReader previously with great success on both .xls and .xlsx files. I am trying to use it on a new project, but am running into an issue where when I call AsDataSet and then iterate over rows in one of the DataTables, all of the cell values are either empty string or DBNull. What can cause this to occur? The file is an .xls that says its 97-2003 file format.

Thanks for the great library!