Thank you for your post.
I have not encountered this before, and I do not see any report of this occurring. Therefore, I'd like to get a copy of the PDF file and your database file so I can try it here and determine why it is happening? Check your Inbox at the top of this page for instructions where to send the file.
I've been playing around with other PDF's and images and they seem to all work fine, the PDF that was having issues was a scanned document so perhaps this caused Filemaker Go to read the orientation incorrectly.
All fine now. Cheers for your help anyway.