Hi Pablo,
CIP3 can be different depending on the needs. With the Heidelberg workflow, the CIP3 information for Computcut comes from our imposition program, Prinect Signa Station. I can remember integrating to Computcut back in 1999. Here is another link on it:
Heidelberg - Compucut - Overview
We also generate CIP3 ink key presetting information from our rips. This is an option for our MetaDimension and Delta, and is a different program then what is used for cutting, although both are part of CIP3. I would ask Art Pro if they provide the CIP3 for cutting? If not, then this explains the problem, they probably only supply the part for ink key presetting, which is different parameters then are needed for cutting. You should also consult Polar as to what programs they support. Good luck.
Regards,
Mark