LaTeX rendering

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Hello people,

I may be doing something stupid, but I can't get any LaTeX markup in the notebook to be rendered by MathJax anymore... (while it works perfectly fine on other sites, like this one, with the same browsers).

I have the problem with Firefox 21 and Chromium 25, and there seems to be a complaint about a missing file:

localhost:8080/javascript/mathjax/dynamic/mathjax_sage.js

so I thought the problem was with my installation (5.9), but I tried both on 5.8 and a freshly installed 5.10 and it doesn't change a thing. I also tried deleting the .sage repertory of my user to see in case a config file was broken, but I didn't notice a difference.

Any clue ?