[AUCTeX] aspell/ispell doesn't work properly.

[Shiyuan]

Hi,

   I notice a problem that when auctex is running,  aspell/ispell misses some mispell.

Try the following example: 

\documentclass[12pt]{report}

\begin{document}

\begin{theorem}[Trace Theorm]

 This is a Theorm. 

 \end{theorem}

\end{document}

%%% Local Variables: 

%%% mode: latex

%%% TeX-master: "test"

%%% End: 

Theorm is misspelled twice. However, when I use spell check buffer, , aspell/ispell missed the misspell in [Trace Theorm] and only detected the second one. When I use M-$ to just check one word, it works. 

Any fix?  I am using auctex 11.86 +Emacs 23.3 (both are from macport).  Thanks.