QTR-Quadtone RIP

I have recently installed Quadtone RIP on a Mac Pro using an Epson
7600 and OSX 10.5.6.

When using A3 centered, the image (14in x 11in) is always 1cm closer
to the top edge? Apart from manually changing the layout, is there a
way to fix this?

It was working fine on my laptop with osx 10.4 with an earler version
of quadtone RIP (the one with two tone curves, not 3)