screenshot of your PDF file 'fill-test.pdf' from comment #4 viewed with the default PDF viewer on Mac OS X. I think this is an issue with PDF viewer Evince (or maybe with poppler) and not with Inkscape's cairo-based PDF export.
JazzyNico, Alvin - can you test this with Adobe Acrobat or other PDF viewers?
screenshot of your PDF file 'fill-test.pdf' from comment #4 viewed with the default PDF viewer on Mac OS X. I think this is an issue with PDF viewer Evince (or maybe with poppler) and not with Inkscape's cairo-based PDF export.
JazzyNico, Alvin - can you test this with Adobe Acrobat or other PDF viewers?