Ok I've looked into this. It is caused by an rtf from MSWord 2000 having a header for the section come AFTER the \secd keyword. We write out section properties before this header comes along so the header/footer properties of the section are not defined at this point.
I'm working on a fix for this. I'll retrospectively put the correct header properties into the piecetable just before when the header/footer section is appended to the document if the document does not contain a header/footer. This should also take care the cases where the section is defined and the same technique may enable us to recover the header/footer information from broken *.abw which arose from this bug. It should be fixed by Monday. I'd like to discuss this over IRC but that port is currently blocked on me. Anyway this will get fixed by me. Cheers Martin