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https://slackbro.pythonanywhere.com/duffing/

What might had happened? Once the LaTeX code (bits of) appeared correctly. Today I realized that it does not.

Have some settings been changed?

I would appreciate a hint.

Thanks a lot

Pretty weird. I checked also with another web browser.

Take a look at the dev tools in the browser.

Mixed Content: The page at 'https://slackbro.pythonanywhere.com/duffing/' was loaded over HTTPS, but requested an insecure script 'http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML'. This request has been blocked; the content must be served over HTTPS.

You need to get your MathJax.js over https.