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I am using classicthesis with the MWE below. When I compile locally, section numbers are not showing, but are included in the Table of Contents. However, compiling with Overleaf does show the section numbers, both in the ToC and in the document. So I think this is an issue with the version/compiler I am using to compile locally (pdflatex on Ubuntu-16.04).

How can I check which version of classicthesis is being called locally by pdflatex? And if it is out of date, how can I update it?

\documentclass{scrbook}
\usepackage[parts,pdfspacing]{classicthesis}

\begin{document}
    \tableofcontents
    \chapter{First chapter}
    \section{First section}
        Hello, world


\section{Second section}




\end{document}

Here is an image of how it looks when compiled locally: Missing section numbers.

Thanks.

Paul Gessler
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Brian
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  • Welcome! This picture (click) represents what I get from your example code. – egreg Nov 18 '20 at 16:59
  • Thank you! Yes that's what I get also on Overleaf. The problem is, when I compile locally, "First section" and "Second section" do not have section numbers preceding them. – Brian Nov 18 '20 at 17:20
  • That's quite curious. Can you please upload the log file you get from the local run? – egreg Nov 18 '20 at 17:42
  • I've uploaded the demonstration here. – Brian Nov 18 '20 at 17:54
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    Oh! TeX Live 2015! You got the infamous titlesec bug! You should really upgrade your TeX system. – egreg Nov 18 '20 at 18:04
  • Indeed updating to TeXLive2020 has worked, thanks @egreg! Although now \subfile{} doesn't work so instead I'm using \input{}. (If you want to post this as an answer I will accept it). – Brian Nov 19 '20 at 14:22

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