Installing mathjax has made the problems viewable.

Thank you for your help and advice everyone.

This was the response from my IT department.

Hello,

The installation directions weren't very precise, however, I think I have what you need. See if it works now. This is what I've done, and have added to our installation instructions.

cd /opt/webwork/

git clone https://github.com/mathjax/MathJax.git

cd MathJax

git gc --prune=now --aggressive

I can verify that there is now a directory /opt/webwork/MathJax/ and your symlink at /opt/webwork/webwork2/htdocs/mathjax does point to the new directory ../../MathJax/ or the full path /opt/webwork/MathJax/

I hope this helps future people