Since converting all my old noteboks over to Jupyter, and making pretty 
printing my default, I have seen 404 errors in the console log. These look 
something like: 

> 404 GET 
> /nbextensions/mathjax/fonts/HTML-CSS/TeX/otf/MathJax_AMS-Regular.otf 
> (127.0.0.1) 2.94ms 
> referer=http://localhost:8888/notebooks/[my_notebook_name].ipynb
>
>  The directory "/nbextensions/mathjax/" is a softlink to 
"~/sage-8.8/local/share/mathjax". As installed, there is no sub-directory 
"otf/" in the chain (spelled out in full) 
"~/sage-8.8/local/share/jupyter/nbextensions/mathjax/fonts/HTML-CSS/TeX/".

A workaround is to create the missing directory and populate it with the 
missing font from GitHub [
https://github.com/mathjax/MathJax/tree/master/fonts/HTML-CSS/TeX/otf]. The 
companion sub-folder "/woff/" is well populated, but for whatever reason, 
my notebooks seem to require .otf files.

FYI, the OS is openSUSE Leap 15.1, and I pulled Jupyter (ipynb) from the 
distro repositories.

Is anyone else seeing 404 errors?

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