pdfshuffler currently uses (through python-poppler) the pixbuf rendering API of poppler-glib (render_to_pixbuf() in particular) which has been dropped starting from poppler-glib 0.17.0 (unstable version for the next stable 0.18). python-poppler will need to be adapted by dropping the pixbuf functions.
Please migrate the rendering code to use the cairo API (the non-pixbuf render() function) of python-poppler.
For more details, see
- the blog of the poppler-glib developer: http://carlosgc.linups.org/gnome/gdk-api-removed-poppler.html
- the poppler 0.18 compatbility bug of python-poppler: https://bugs.launchpad.net/poppler-python/+bug/776234