We recently upgraded to WeBWorK 2.16 and mathjax seems to work in general.

But in the solution part it does not work at all. It does not show any math formulas in any solutions.

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Mathjax is displaying properly in solutions on my 2.16 installation. Here are a few things to check:

- Did you do the 'npm install' step from the installation instructions? (I'm assuming that you did since mathjax is working elsewhere)
- Did you restart apache after upgrading?
- Try clearing your browser cache, or doing a shift-reload of the page in question
- Check the error console in your browser to see if there are any messages that might point to what is going wrong

Found the mistake.

From 2.15 localOverrides.conf I copied accidentally the line

$webworkURLs{MathJax} = "https://cdn.jsdelivr.net/npm/mathjax@2/MathJax.js?config=TeX-MML-AM_HTMLorMML-full";

Changing it to

$webworkURLs{MathJax} = "$webworkURLs{htdocs}/mathjax/es5/tex-chtml.js";

solved the problem.