[XeTeX] Italic and font spec 2.5c vs 2.4a

[Gildas Hamel]

I just updated fontspec from 2.5a to 2.5c via TeX Live Utility. I cannot get italic face to work. I had to revert to 2.5a. Do others see the same thing?
—Gildas

 Minimum example:

%!TEX TS-program = xelatex
%!TEX encoding = UTF-8 Unicode

\documentclass[12pt]{article}
\usepackage{fontspec}
\begin{document}
\emph{Lorem ipsum dolor sit amet}, consectetaur adipisicing elit...
\end{document}

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