[XeTeX] Probleme with font Scheherazade and XeTeX 0.998.1

[HAF MED]

Hello ;

I juste update MikTeX 2.7 and I get a problem with the font Scheherazade
"SIL"

\documentclass[a4paper,11pt]{article}
\usepackage{fontspec}
\usepackage[novoc,fdf2noalif]{arabxetex}
\newfontfamily\arabicfont[Script=Arabic,Scale=1,WordSpace=1]{Scheherazade}
\begin{document}
\begin{arab}
كتاب
\end{arab}
\end{document}

the arabic lettres is not assembled !

I attache  the output pdf file.

Thanks for help
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