Following up my own post, I think the unpaper error message is a red herring.
As far as I can see from looking through the source of unpaper, it *only* inputs/outputs ppm/pbm/pgm format files, and can't read or write a PDF. So either I'm using the wrong version of unpaper or Roberto's suggested manual tests were wrong? What exactly is the file format pipeline for importing an Office file so that I can check that I have all of the right tools, and they operate properly? Is there any way to get more information than just 'error'? I've tried enabling DEBUG=True, but I don't appear to be getting any more output in the apache error logs, and it doesn't seem to be generating any other logfile that I've found. Cheers, Steve. --
