Hello,
in the "embedded postscript" from Tips and tricks:
http://lilypond.org/doc/v2.9/input/test/collated-files.html#embedded-postscript.ly
the curved lines don't appear in the output, whereas they do in 2.8.
In my own scores, I have noticed something similar with Lily 2.9.21:
embedded postscript code doesn't show, or is drawn at the upper left
corner of the page it belongs to, as if there was in the PS output a
missing "translate" statement before the embedded postscript.
Keep up the good work on LilyPond!
Cheers,