[XeTeX] Probleme with font Scheherazade and XeTeX 0.998.1

[HAF MED]

 Hello

No I have not this probleme with other font, just Scheherazade.

par exemple the font Lateef of the same organisation "SIL" hase not this
probleme :

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



I attache the output

thanks
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