Envelope printing misplaced

users
#1

I'm unable to properly print a #10 envelope using Apple Mavericks on a Canon
iP2700 printer. Both Sender and Addressee are printed about 25 mm too low.
This printer's paper feed automatically centres the envelope so no way to
physically adjust it. All settings appear to be correct, with correct sizes
and margin spacings indicated, but they print incorrectly. It is possible to
adjust these text blocks lower, but not higher in LO. Still learning LO so
any suggestions appreciated.

#2

Is it automatically centred vertically or horizontally.
If vertically can you add a couple of blank lines and a period say to pad the address.
Steve