Actually, that brings up something I should have clarified with you. How are you generating the PDF from within VFP?
1) Are you sending a report to the Acrobat distiller, or are you using another third party tool like XFRX? -- I'm sending it to the distiller by first creating a PS file with the "Apple Color LW 12/660 PS" driver.
2) If you're using Acrobat distiller, how are you selecting the printer? -- I read their registry to determine which version of Adobe they have then hard code the name accordingly (i.e. set printer to "Acrobat PDFWriter")
3) If you've hardcoded the name, it's possible your clients are using a different name. -- They can change the name of the print driver upon installation of Acrobat Adobe? All I used was Rick Strahl's past code and altered it a little. He does use a variable, but the transfer of drivers wasn't taking unless I hard coded it.