Do you have a header layout part?
Does the background image touch or cross the boundary between header and body layout parts?
Nope, the layout as only a BODY part, Helpful Harry also asked me that on the Filemaker google group.
I found the solution, the full list is on the news group comp.databases.filemaker
The picture is an export from Adobe save as other: JPEG or PNG so it's a form 8-1/2x11 reduce to approx 95% so it will fit in the page.
I Have tried to import as JPG and PNG, both same result.
I'm starting to thing, the problem is with the picture itself.
I have also try to go edit the picture into Corel Paint or Windows Paint to trim the unused edge, so the file is reformat and reduce in size and import it, still no success.
So I try with a picture taken from my iphone, guess what! it's printing full page!
My guess is the picture itself, the Adobe format leave something in the picture that create a problem and FM with WinXP can't handle it.
I have a big screen monitor, so I put my PDF file and use Win7 screen capture, and create a capture of the form, save it into JPG (in 2 parts) and import those 2 parts into FM, resize and edit some fields to match... and VOILA ! it's working properly on Win7 AND WinXP.
So the problem was the picture file generated from Adobe Acrobat Pro was for some reason creating this problem.