Digital BW, The Print

I am using QTRgui under Windows XP (with an Epson 4000) and European 
sized papers (A3 and A4).

I haven't yet obtained a "centered" print (though the "centered" option 
is on under the QTR options). Each time it goes either to the right of 
the paper or to the left (same for the top or the buttom). Same if I 
try to "move" the picture in the dedicated icon under QTR.

Any solution or tricks? 

THank you for your help

JM Humbert
Paris, France