The following minimal example:
\documentclass{scrartcl}
\usepackage{fontspec}
\begin{document}
test \emph{emph} \textit{textit} \textbf{textbf}
\end{document}
outputs this:
i.e. the \emph command is not working.
There are no error messages or warnings.
Removing the line \usepackage{fontspec} produces the expected result (“emph” in italics).
The result is the same regardless whether LuaLaTeX or XeLaTeX is used.
What’s going on?
Using updated TeX Live 2016 on Linux.
