Recent updates to l3kernel and l3packages (7-19-2012 packaging timestamp) seem

to have broken interactions with several other packages, most especially

unicode-math. If I compile the following (using LuaLatex, MikTeX 2.9), all of

the maths are rendered in upright font (and not the correct italic).

Colleagues who have *not* update l3kernel and l3packages report have no

problems - suggesting (but not proving) the problem lies with the updates.

\documentclass{article}

\usepackage{unicode-math}

\setmainfont{Cambria}

\setmathfont{Cambria Math}

\begin{document}

Here is a simple equation:

\begin{equation}

\frac{dN}{dt}=rN\left(1-\frac{N}{K}\right)

\end{equation}

\end{document}