\listfiles
\documentclass{article}
\usepackage{siunitx}
\sisetup{debug}
\begin{document}
This is the bug test-case document for the \textsf{siunitx}
package.\\
Please put your demonstration here, and e-mail to the package
author.
\begin{center}
  \texttt{joseph.wright@morningstar2.co.uk}
\end{center}
\end{document}
