[OS X TeX] TeXShop encoding issue

[Rowland McDonnell]

Hello,

I've just tried to use:

\usepackage[latin9]{inputenc}

to allow me to use `native' non-ASCII characters in my input 
documents and the results have not been as expected.

I'm using TeXShop 3.92 and macOS High Sierra v10.13.1 (17B1003)

The TeXShop Source preferences pane lists "Encoding" as Western 
(ISO Latin 9).

When I process the following file with LaTeX:

\documentclass{article}
\usepackage[latin9]{inputenc}
\begin{document}

“ ”  ‘ ’

\end{document}

the output pdf file contains four question marks where the 
quotation marks should be:

? ? ? ?

Note: I created the test file from scratch using TeXShop's 
File->New command.

On the off chance it might help, I tried:

\documentclass{article}
\usepackage[latin9]{inputenc}
\usepackage{t1enc}
\begin{document}

“ ”  ‘ ’

\end{document}

and got the same results.

I closed the file and opened it again.  The quotation marks in 
the input file had all been turned into question marks.  The 
document text which had looked like this:

\begin{document}

“ ”  ‘ ’

\end{document}

Now looked like this:

\begin{document}

? ? ? ?

\end{document}

When I LaTeXed that file, I got question marks in the output file.

I changed the input file to:

% !TEX encoding = IsoLatin9
\documentclass{article}
\usepackage[latin9]{inputenc}
\usepackage{t1enc}
\begin{document}

“ ”  ‘ ’

\end{document}

LaTeXing this file produced question marks in the output instead 
of quotation marks.

I saved this file, closed it, and reopened it in TeXShop and the 
input file again had the quotation marks replaced by question marks.

I assumed some kind of an encoding problem had occurred, deleted 
the question marks, and replaced it with:

\begin{document}

“ ” ‘ ’

\end{document}

Processing that text using LaTeX produced an output of four 
question marks (and a page number) as before.

I closed the file and opened it again in TeXShop, to find that 
once again the quotation marks I'd entered had been turned into 
question marks:

? ? ? ?

TeXShop's Typesetting preferences are set to:

Dafault Command: LaTeX

Default Script: Pdftex

It appears something is not working properly.  I'd appreciate 
any insights into this issue.

Cheers,
Rowland.

P.S.  A typical console log from one of my tests looks like this:

This is pdfTeX, Version 3.14159265-2.6-1.40.18 (TeX Live 2017) 
(preloaded format=pdflatex)
  restricted \write18 enabled.
entering extended mode
(./file encodings test 1.tex
LaTeX2e <2017-04-15>
Babel <3.10> and hyphenation patterns for 84 language(s) loaded.
(/usr/local/texlive/2017/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/local/texlive/2017/texmf-dist/tex/latex/base/size10.clo))
(/usr/local/texlive/2017/texmf-dist/tex/latex/base/inputenc.sty
(/usr/local/texlive/2017/texmf-dist/tex/latex/base/latin9.def))
(/usr/local/texlive/2017/texmf-dist/tex/latex/base/t1enc.sty)
(./file encodings test 1.aux) [1{/usr/local/texlive/2017/texmf-var/fonts/map/pd
ftex/updmap/pdftex.map}] (./file encodings test 1.aux) ){/usr/local/texlive/201
7/texmf-dist/fonts/enc/dvips/cm-super/cm-super-t1.enc}</usr/local/texlive/2017/
texmf-dist/fonts/type1/public/cm-super/sfrm1000.pfb>
Output written on "file encodings test 1.pdf" (1 page, 10010 bytes).
SyncTeX written on "file encodings test 1.synctex.gz"
Transcript written on "file encodings test 1.log".