kpfonts: no errors, no warnings but no PDF

Question

I just installed kpfonts via MikTex Package Manager. I tried to reproduce the following example which is taken from this thread

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{ntheorem}
\newtheorem{theorem}{Theorem}
\usepackage{amsmath}
\DeclareMathOperator{\Res}{Res}
\usepackage{kpfonts}
\begin{document}\pagestyle{empty}
\begin{theorem}[Residue Theorem]
Let $f$ be analytic in the region $G$ except for the isolated 
singularities $a_1,a_2,\dots,a_m$. If $\gamma$ is a closed 
rectifiable curve in $G$ which does not pass through any of the 
points $a_k$ and if $\gamma\approx 0$ in $G$, then
\[
  \frac{1}{2\pi i}\int_\gamma\! f = \sum_{k=1}^m 
  n(\gamma;a_k)\Res(f;a_k)\,.
\]
\end{theorem}
\end{document}

It runs fine with, say, mathpazo, but when I compile with kpfonts it opens my PDF viewer, but it doesn't show the file and it actually doesn't produce any, that is there is no .pdf in my working dictionary. There are no errors or warnings either. Don't get it.