You might also explore using other software to do this report. As I recall, Personal Ancestral File did an Ahnentafel Table.
PAF is free and you can easily export and import a gedcom file to it and then do an Ahnentafel Table. Just do a Google search for a download site.
It's been a few years since I used PAF, so I might be remembering wrong, but it might be worth checking out.