For the past three weeks now I have tried to get Lightroom 5 to upload to Blurb for photo book. Spasmodically it has worked, but on all four occasions I have had photos upside down when previewing Blurb. I have done everything that has been suggested to me, bar throwing the computer away, but to no avail. It just keeps printing photos upside down, and they are not always the same ones. Could somebody out there please give me an explanation for this. When I try to do a pdf, it does not respond, and is just not working.