point-and-click not working in landscape paper

[libero . mureddu3]

Hello!
If I set the paper size and orientation, point-and--click doesn't work.
Without those settings, everything works ok.
I tried this with both lilypond.app 2.6.0 and 2.7.0, and using preview.app
to see pdf files.
mac os 10.3.9
ibook g4
Thanks
Libero

#(set-default-paper-size "a4" 'landscape)
{ c'4 d' e' f'}