I produce a quarterly bulletin, which I publish as a pdf. This is written in Pages 4.3 and exported. Previous issues on OS X 10.8 have my name as Author. Recent issues on OS X 10.9 show unknown author.
How can I change this on new exports?
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Doesn't fix your export problem, but this is a fairly easy workaround. You can easily edit PDF metadata using a very simple automator workflow:
Now you can right click a PDF file and under services select your service, or select a PDF file and use your newly created shortcut to launch your Service.
Hope this helps.
I use Pages 5.2 and notice that there is a preference for Author, however in my testing (under Mavericks) PDFs created by Pages do not inherit this value.
I think you are going to have to use a third party tool to edit the Author meta data after you create the PDF.
It doesn't appear you can do this in Preview.app or Adobe Reader. You can do this in Acrobat Pro ($), Automator (with the "Set PDF Metadata" function) or PDFInfo (free). I am sure that are other programs as well.