Hey a.l.e.
i tried the office document, and it still is visible. it certainly must be the acrobat setting, but still i can not find it.
because this pdf file from a friend does not show the line.
i will just have to accept the line and hope on the gallerist's computer doesnt show

saar
edit: i also noticed another problem when opening it in browsermode instead of the adobe reader prog. The pdf doesnt show as a spread, only as a one page file.
in my asl file its a 2 page doc and when exporting it, i use the setting 'double page right'
do i make another mistake somewhere?