I am one of the RM8 lurkers who primarily uses RM7 still. I have tried making a direct line gedcom from myself to my medieval ancestors of some 25 or 30 generations. I do this by attempting to export a gedcom file from the file menu, then chose select from list, then chose direct ancestors of the highlighted person. I have started on my name in pedigree view, plus checked myself in the drop-down list of names. Why is the program only exporting me and not the line? I know I once did this in the past.
I just followed your directions and it worked fine for me so I’d suggest trying it again.
Did you set the number of generations to more than 1?