trillspan issue

[Chip]

I am using lilypond-2.4.2 on windoze for the first time (have 2.2 on my 
FreeBSD box). I am trying to use startTrillSpan and stopTrillSpan with a 
skip note of duration 0 to make it stop before the bar line, but that 
doesn't to work, the trill still continues across the barline and over 
the first note of the next bar. I have the .pdf and the .ly available 
here - http://www.wiegand.org/~chip/19.pdf and 
http://www.wiegand.org/~chip/19.ly. Also notice that the one measure 
with two half-notes and a trill on each note, measure 40, the trills 
collide becuase of the length.
What am I doing wrong?
Regards,
Chip
PS,
If you run the file 19.ly you should also get an error on line 71 
(measure 35) for the voice.TextScript override stuff. It seems to work 
fine with the error, but what is causing the error?