For some odd reason LR5 could not login to Blurb, so I thought I would just upload the PDF files exported from the Book Module. When I upload those files to Blurb I receive this error:
Your preflight check is complete, but errors have been found.
PDF/X-3, Acrobat 4 (PDF 1.3) compliant
Your book files need to be in the PDF/X-3 format.
Is the Blurb Connection the only way to get a proper book out of LR5 to Blurb?
This doesn't make sense to me.