I notice/remember I'm using an older version of PDFCreator (not sure which but it does offer an update) -- I suppose I should upgrade and check again. [/edit]
creating a PDF from a vector file which has a gradient fill:
the bands in the gradient are separated slightly leaving a thin white line between each band.
screenshot from Adobe Reader of PDF (zoomed in):
macro-photo of quality printout on photo paper (note I increased contrast to make it more visible):