Which version of LabVIEW and operating system are you using? There was a known issue with LabVIEW 6i under Windows 98/ME systems. There are a number of workarounds however, that will hopefully satisfy your application needs.
Workarounds:
1) Use bitmap printing or black&white PostScript printing.
2) Or, Print to HTML, then print from a web browser.
3) Or, Print from a Windows NT/2000 machine instead of a 9X/ME machine.
Some users have also corrected the error by removing all other network & fax printers that were not being used and then reinstalling the printer's driver.
Jonathan Hildyard
Applications Engineer
National Instruments