# Endmarks not showing up, thmmarks, ntheorem

I can't get thmmarks in ntheorem to work in Latex.

I've tried searching around the web, and I can't figure out what I'm doing wrong. I suspect there's something simple I'm missing. Here's a sample of my code:

\documentclass{article}
%
%
\usepackage{amsmath}
\usepackage[thmmarks,amsmath]{ntheorem}
%
%
\theoremstyle{break}
\theorembodyfont{\normalfont}
\theoremseparator{:}
\newtheorem{ex}{Example}
%
\begin{document}
\begin{ex}
This is my example. It's an example of an example \dots
$\int_{- \infty}^{\infty} e^{-x^2} \; \text{dx}$
\end{ex}
\end{document}


I tried recompiling ntheorem.sty to no avail.

Thanks for your help, I appreciate it.

-

\theoremsymbol{*}