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This is essentially the same problem as in Paul Taylor's diagrams.sty NEVER HAPPEN error but the solution given there isn't working for me.

I previously had no problem with this on my old HP laptop running Windows 10, but I just got a new Dell with Windows 11. I installed MiKTeX (current version appears to be 22.10) and TeXstudio as I usually do. Now if I run the following

\documentclass[12pt]{article}
\usepackage{diagrams}
\begin{document}

\begin{diagram}
A & \rTo & B
\end{diagram}
\end{document}

I get an error that reads "Commutative Diagram: * THIS (S) SHOULD NEVER HAPPEN! * at lines 5--7 [1", although the TeXing finishes and the output pdf file seems to show the correct diagram.

I tried to implement the solution from the link above, but when I insert that code, I get the following error:

Undefined control sequence. \expandafter\foo\row@to@buffer

Any suggestions for fixing this would be much appreciated.

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  • Are you using the most recent version, 3.96? Once I downloaded it from the author's homepage, your MWE compiled without issues with TL 2023 (Linux).
    – Ingmar
    Commented Apr 10, 2023 at 7:07
  • 1
    the version on ctan (3.93) is time bombed and does not work at all, use 3.96 from paultaylor.eu/diagrams save V3,96.tex as diagrams.sty
    – David Carlisle
    Commented Apr 10, 2023 at 7:37
  • Do remember to read the copyright statement in the file, especially the last paragraph.
    – daleif
    Commented Apr 11, 2023 at 10:06

1 Answer 1

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The version on ctan (3.93) is time bombed and does not work at all, use 3.96 from http://paultaylor.eu/diagrams save V3,96.tex as diagrams.sty then the adjustment at Paul Taylor's diagrams.sty NEVER HAPPEN error should work.

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