I'm suddenly getting some strange errors in LaTeX rendering on my weblog. Every occurrence of the symbol "\mu" on its own shows up as an error bar, but instead of the sual error message it says "latex path not specified". This only happens (so far) for \mu on its own, not for any other symbols, and not in a more complicated expression. It was not doing this a couple hours ago.
The blog I need help with is unapologetic.wordpress.com.