Following the 1.18 deployment, there are now many examples of <math> expressions that previously rendered correctly and now report the error:

"Failed to parse (PNG conversion failed; check for correct installation of latex and dvipng (or dvips + gs + convert))"

Simple examples include:

<math>\dot \vec B</math>

<math>\chi(\hat\mathbf{C})=2.</math>

A work around exists by adding extra braces to the TeX markup as described here:

http://en.wikipedia.org/wiki/Wikipedia:Village_pump_(technical)#Math.2FLatex

However, it shouldn't really be necessary to go around and update tons of math expressions that were working before the upgrade.

**Version**: unspecified

**Severity**: major