> But the wheels turning here mystify me. What is causing the > `image_filename` (formerly `last_image_filename`) to go > uninitialized, why only in very specific circumstances?
pdfmark uses the suppression mechanism bounding box output to find the anchor positions, but no images are involved. The Postscript branch in suppress_node::tprint should be perfectly okay with an empty image_filename. At the moment, the entire "is_html / else postscript (or other device)" switch is being skipped if we have no image_filename, resulting in no output of the link anchor information for pdfmark.
