Updated my tlmgr install (and all packages I have installed today) earlier today, and something changed in the font loaded by unicode-math, which I can't figure out of.
The preamble I've been using for making the beamer presentations is as below:
\RequirePackage{atbegshi}
\documentclass[smaller]{beamer}
\usefonttheme{professionalfonts}
\mode<presentation>{%
\AtBeginSection{%
}
\useoutertheme[nofootline]{wuerzburg}
\useinnertheme[outline,shadow]{chamfered}
\usecolortheme{shark}
\setbeamercovered{transparent}
}
\setbeamertemplate{navigation symbols}{}
\usepackage{fontspec,microtype,amsmath}
\usepackage{unicode-math}
\usepackage{siunitx}
\usepackage[retainorgcmds]{IEEEtrantools}
Before updating, the font resembled:

After the update, the font resembled:

As I haven't changed anything at all in the preamble, I have to assume that one of the packages I use was updated (but since I didn't pay attention to the command line window I'm not sure of which).
I've tried to load unicode-math with the options math-style=TeX and math-style=ISO without any luck. Also tried to remove fontspec, microtype, and amsmath, but still the same.
Any input on how to get the font to be as it was before the update?
unicode-mathand it's support packages: see http://tex.stackexchange.com/search?tab=active&q=unicode-math. This could be the same thing. – Joseph Wright Jul 30 '12 at 12:28