Multiple stems on chord

[Peter Chubb]

With Lilypond 1.3.145, I see two stems on each chord (one up, one
down) in this sample, no slur, and no tied f-sharp.

g=\notes\relative c' {
        \time 6/8; %\key d \major;

        <fis,2.( a d a' d fis ~ > 
         <)a4. d a' d  fis> <a4. e' a cis g'> |
}
\score {
        \context Staff { \g}
}

If the key declaration is uncommented, the output is correct, except
for the missing tie.
Unfortunately, this occurs in the middle of a much longer piece where
even with a correct key signature I see two stems on each chord, and
no slur.

Peter C