[OS X TeX] microtype options not working with MacTeX-2013

[Tobias Tangemann]

Hi,
I'm trying to use the microtype package on my mac using MacTex-2013.
Setting a few microtype options seems to trigger the generation of some 
font stuff with "mktextfm",
but it fails with the error message:

! Font csnameendcsname=bchr8t+20 at 10.95pt not loadable: Metric (TFM) 
file not found.

Best regards
Tobias Tangemann

Minimal example:

\documentclass{scrbook}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{charter}
\usepackage[activate = true,
             tracking = true,
             kerning = true,
             spacing = true]{microtype}

\begin{document}test\end{document}