Image & text shifting in printed PDFs

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I have a book cover for print, created in Scribus 1.4 and imported to 1.5 to create a pdf/x-1a. I've had two proofs printed from this file. The first was perfect. In the second, there was shifting of some of the images and text. It's messed up the formatting and there is overlapping of text and image in one area. Any idea what would cause this or how to fix it?

I queried the printer (CreateSpace) but they could not verify that the file had changed.