1 pixel boarder around full bleed images from Keynote

When you export a deck from Keynote and view in Adobe PDF it shows what looks like a 1 px boarder around every page. If you open in "Preview" it does not show this boarder, which tells me it's an artifact being generated by the reader. It did not used to do this. Does anyone have a fix? It is ruining creative decks which are meant to be full bleed, creating a gross little white boarder around them. Thanks