I hate to keep asking, but my experience, on a Win 7 machine, is that P800 curves are not working on a P800. Not only do they not produce a complete image on 17" photo paper, they band terribly when printing on 13" matte paper at 1440 dpi (as recommended by the paper manufacturer). From the zero responses that I've received, it appears that no one else is using a P800 ... or printing on 17" paper. I don't know if it's the curves or me, and I've been using QTR for at least 6 years and 3 other printers with no issues.
Al Benas