A problem with "placing grace notes between arpeggios and chords"

[Robert Blackstone]

Hello,

Snippet http://lsr.di.unimi.it/LSR/Item?id=410 shows an excellent way to insert 
a grace note between an arpeggio and the arpeggiated chord (BTW, the example is 
from Chopin's Nocturne No. 11 Op. 37, No. 1, not Op.37 No. 2 )

Anyway, in this form it compiles on my system. But since I prefer to use the 
real pitches, I commented out "\relative c' "  and adjusted all notes.
Result: the notes are perfect but there are no arpeggios any more. 

Why?
And what can I do to correct it (except going back to "\relative c' ")?

Thanks in advance for any advice.

Best regards, 
Robert Blackstone