I used win 7 and suddenly Mathjax doesn't work at https://math.stackexchange.com/ using
google chrome, firefox, ie9
It work at another site like this site.
so how to fix it ?
edit: the error messag in java script at google chrome :
There is a fest of browser-hijacking software on your computer. Google "Topic Torch", "clkmon" and so forth. I can't tell how or if this interferes with execution of MathJaX, but until the system is clean, non-working MathJax should be the least of your worries.