Hi John. Thanks for getting back. I have tried both - yes pdflatex is executable at /Libary/TeX/Root/bin/x86_64-darwin/pdflatex and at the new Tex-2017 installation at /Library/Tex/texbin. Yes I have tried putting pdf-engine=pdflatex in the command and this produces the error message "Error producing PDF" with no other details. The verbose log is attached above.

On Saturday, November 11, 2017 at 3:38:49 PM UTC+13, John MacFarlane wrote:
Have you verified that you have an executable file at
/Library/TeX/Root/bin/x86_64-darwin/pdflatex ?

If pdflatex is in your path, can you try just

--pdf-engine=pdflatex ?

+++ Kyle Eggleton [Nov 10 17 16:28 ]:
>   Hi, I have just updated to pandoc 2.0.1.1 on my Mac running MacOS
>   10.12.6 and since updating I have been unable to generate PDFs. The
>   error message that I am getting is pdf-engine
>   /Library/Tex/Root/bin/x86-64-darwin/pdflatex not known.
>   My command is: pandoc -r markdown -markdown+smart -N  --filter
>   /usr/local/bin/pandoc-crossref --filter /usr/local/bin/pandoc-citeproc
>   --pdf-engine=/Library/TeX/Root/bin/x86_64-darwin/pdflatex
>   --template=/Users/kyle/Documents/IT/Pandoc/templates/thesis.latex
>   file.md -o file.pdf
>   This command was working fine prior to updating to the new version of
>   Pandoc (noting that the old command included
>   --latex-engine=path/to/pdflatex rather than
>   pdf-engine=path/to/pdflatex)
>   I have verified that I have the correct path to pdflatex.
>
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