PDF WATERMARK NOT VISIBLE IN READER

HI Gurus,

I have created a simple script which reads a value from a form field and creates a watermark on pdf document.

I can view the watermark in Acrobat Pro 9 but unable to see the watermark when viewing through acroabt reader 9. Below is the script I am using. I have not set bOnScreen or bOnPrint and have left as default which I believe is true.

var cMyText = this.getField("WATERMARKADDRESS").value;

this.addWatermarkFromText({ 

cText: cMyText, 

nTextAlign: app.constants.align.center,

nRotation: 45

});

Any help provided would be greatly appreciated.

Thank Lee