Interactive PDF Link to Notes in Preview

[Zone Dremik]

Hello,
After a recent upgrade to my computer, the function that links music notes (and 
lyrics) in the PDF viewer, to the text in the Lilypond files, has stopped 
working.

The ability to click on notes and lyrics in the preview screen, and have the 
exact point highlighted in the corresponding Lilypond file was so enormously 
useful, that the loss of this function has become a great barrier to efficient 
use of the program.

I am using Lilypond Version 2.18.2-1 
Apple Macintosh System 10.11.6
Apple Preview Version 8.1 (877.7)

I tried to look through the user-forums, but could not find the right search 
terms to describe this function.

(Should this post be sent to Lilypond_Bugs instead?)

Any help would be greatly appreciated.
Thank you
Zon

(New at posting to user-groups; please excuse ineptitude, thank you)