question about accidentals

[Lucas Gonze]

Given the following score, the 2nd note should come out in the DVI as 
an F sharp, but is instead an F natural.  Any suggestions?  Have mercy 
-- I am still struggling through the "hello world" stage.

\score {
       \notes {

              \clef treble
              \time 3/8
              \key g \major

                        g16 f e dis e c

       }
       \paper {}
}

Lilypond version:
bash-2.05a$ ly2dvi --version
ly2dvi (GNU LilyPond) 1.6.7

OS:
bash-2.05a$ uname -a
Darwin Lucas-Gonzes-Computer.local. 6.6 Darwin Kernel Version 6.6: Thu 
May  1 21:48:54 PDT 2003; root:xnu/xnu-344.34.obj~1/RELEASE_PPC  Power 
Macintosh powerpc

Thanks!

- Lucas Gonze