Take a look at the General tab of in the field properties panel (Select the field with the "Object Select" tool, right click and select properties). It's possible that some how the field properties have been changed to "Visible but doesn't print". Make sure this is set to "Visible".
The Acrobat JavaScript Reference, Use it Early and Often [url=http://partners.adobe.com/public/developer/en/acrobat/sdk/ pdf/javascript/AcroJS.pdf]Acrobat JavaScript Reference[/url]
Thom Parker
WindJack Solutions
[url=http://www.windjack.com]www.windjack.com[/url]
The Acrobat JavaScript Reference, Use it Early and Often
[url=http://partners.adobe.com/public/developer/en/acrobat/sdk/
pdf/javascript/AcroJS.pdf]Acrobat JavaScript Reference[/url]
Thom Parker
The source for PDF Scripting Info
www.pdfscripting.com
Very Important - How to Debug Your Script