About X-Symbol

I'm using X-Symbol package on AUCTeX.  It looks good.  

However, everytime, after I start the GNU Emacs and load the LaTeX source file,
the buffer always shows "Modified" status. This is bad because I need save all related LaTeX and BibTeX files before I compile them.
Furthermore, if I use "TeX-auto-generate(-general)" command, it always asks me whether I need save the buffer before Emacs closes it.
Hundreds of such questions prompt.

Is it possible to solve this problem?

I think "preview-latex" can do a much better job.  However, it cannot change the buffer "online".

Thanks.

BTW: I'm using AUCTeX 11.54
                         CVS Emacs 21.3
                         Windows XP.

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Adam