Have done as you suggested. Here is the verbose log:

mpholt55:Desktop kyle$ pandoc -r markdown --pdf-engine=pdflatex trial.md -o trial.pdf --verbose
[makePDF] temp dir:
/private/var/folders/65/gpz82csd1_s358m496fk0ff5lmh3lj/T/tex2pdf.5468
[makePDF] Command line:
pdflatex "-halt-on-error" "-interaction" "nonstopmode" "-output-directory" "/private/var/folders/65/gpz82csd1_s358m496fk0ff5lmh3lj/T/tex2pdf.5468" "/private/var/folders/65/gpz82csd1_s358m496fk0ff5lmh3lj/T/tex2pdf.5468/input.tex"

[makePDF] Environment:
("TEXINPUTS","/private/var/folders/65/gpz82csd1_s358m496fk0ff5lmh3lj/T/tex2pdf.5468:")
("TERM_PROGRAM","Apple_Terminal")
("SHELL","/bin/bash")
("TERM","xterm-256color")
("TMPDIR","/var/folders/65/gpz82csd1_s358m496fk0ff5lmh3lj/T/")
("Apple_PubSub_Socket_Render","/private/tmp/com.apple.launchd.NXDmkrZaBu/Render")
("TERM_PROGRAM_VERSION","388.1.1")
("TERM_SESSION_ID","8FB45A14-DCBD-467E-8CAA-212CFEB01C0F")
("USER","kyle")
("SSH_AUTH_SOCK","/private/tmp/com.apple.launchd.CJLCVbzkwg/Listeners")
("__CF_USER_TEXT_ENCODING","0x67480E71:0x0:0x2")
("PATH","/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/TeX/texbin:/opt/X11/bin")
("PWD","/Users/kyle/Desktop")
("LANG","en_NZ.UTF-8")
("XPC_FLAGS","0x0")
("XPC_SERVICE_NAME","0")
("SHLVL","1")
("HOME","/Users/kyle")
("LOGNAME","kyle")
("DISPLAY","/private/tmp/com.apple.launchd.2MooiJHYB4/org.macosforge.xquartz:0")
("SECURITYSESSIONID","186a7")
("_","/usr/local/bin/pandoc")
("OLDPWD","/Users/kyle")

[makePDF] Contents of /private/var/folders/65/gpz82csd1_s358m496fk0ff5lmh3lj/T/tex2pdf.5468/input.tex:
\PassOptionsToPackage{unicode=true}{hyperref} % options for packages loaded elsewhere
\PassOptionsToPackage{hyphens}{url}
%
\documentclass[]{article}
\usepackage{lmodern}
\usepackage{amssymb,amsmath}
\usepackage{ifxetex,ifluatex}
\usepackage{fixltx2e} % provides \textsubscript
\ifnum 0\ifxetex 1\fi\ifluatex 1\fi=0 % if pdftex
  \usepackage[T1]{fontenc}
  \usepackage[utf8]{inputenc}
  \usepackage{textcomp} % provides euro and other symbols
\else % if luatex or xelatex
  \usepackage{unicode-math}
  \defaultfontfeatures{Ligatures=TeX,Scale=MatchLowercase}
\fi
% use upquote if available, for straight quotes in verbatim environments
\IfFileExists{upquote.sty}{\usepackage{upquote}}{}
% use microtype if available
\IfFileExists{microtype.sty}{%
\usepackage[]{microtype}
\UseMicrotypeSet[protrusion]{basicmath} % disable protrusion for tt fonts
}{}
\IfFileExists{parskip.sty}{%
\usepackage{parskip}
}{% else
\setlength{\parindent}{0pt}
\setlength{\parskip}{6pt plus 2pt minus 1pt}
}
\usepackage{hyperref}
\hypersetup{
            pdfborder={0 0 0},
            breaklinks=true}
\urlstyle{same}  % don't use monospace font for urls
\setlength{\emergencystretch}{3em}  % prevent overfull lines
\providecommand{\tightlist}{%
  \setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
\setcounter{secnumdepth}{0}
% Redefines (sub)paragraphs to behave more like sections
\ifx\paragraph\undefined\else
\let\oldparagraph\paragraph
\renewcommand{\paragraph}[1]{\oldparagraph{#1}\mbox{}}
\fi
\ifx\subparagraph\undefined\else
\let\oldsubparagraph\subparagraph
\renewcommand{\subparagraph}[1]{\oldsubparagraph{#1}\mbox{}}
\fi

% set default figure placement to htbp
\makeatletter
\def\fps@figure{htbp}
\makeatother


\date{}

\begin{document}

Hi

\end{document}

[makePDF] Run #1

[makePDF] Run #2

[makePDF] Run #3

Error producing PDF.

On Saturday, November 11, 2017 at 3:58:18 PM UTC+13, John MacFarlane wrote:
You only provided part of the log (and I didn't see any
error messages).  Try converting with --pdf-engine=pdflatex
and a really simple input file like ("*hi*").

If it succeeds with the simple file, then the problem has
to do with the content in your file.  In this case we'd
need to see more of the verbose log.

+++ Kyle Eggleton [Nov 10 17 18:48 ]:
>   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
>     >   [1]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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>     d6542d6e-931b-4855-
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>     d/optout.
>     >
>     >References
>     >
>     >   1. mailto:[7]pandoc-discuss+unsubscribe@googlegroups.com
>     >   2. mailto:[8]pandoc-...@googlegroups.com
>     >   3. [9]https://groups.google.com/d/msgid/pandoc-discuss/d6542d6e-
>     931b-4855-8673-4d0156d46121@googlegroups.com?utm_medium=
>     email&utm_source=footer
>     >   4. [10]https://groups.google.com/d/optout
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>References
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>   1. http://file.md/
>   2. javascript:/
>   3. javascript:/
>   4. https://groups.google.com/d/msgid/pandoc-discuss/d6542d6e-931b-4855-
>   5. http://40googlegroups.com/
>   6. https://groups.google.com/d/optout
>   7. javascript:/
>   8. javascript:/
>   9. https://groups.google.com/d/msgid/pandoc-discuss/d6542d6e-931b-4855-8673-4d0156d46121@googlegroups.com?utm_medium=email&utm_source=footer
>  10. https://groups.google.com/d/optout
>  11. mailto:pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>  12. mailto:pandoc-...@googlegroups.com
>  13. https://groups.google.com/d/msgid/pandoc-discuss/e9a5dc66-97b7-4842-bc39-71f9f2a83682@googlegroups.com?utm_medium=email&utm_source=footer
>  14. https://groups.google.com/d/optout

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