PDF not working after WPTools 6.07 update

I upgraded WPTools from 6.06 to 6.07 and now my PDF's are blank. The right number of pages is being produced, but they are all blank.

The problem only occurs when I run on Windows Server 2003. If I run on XP or Server 2000 everything is fine.

Using WPTools Prem 6.07, wPDF Internet 3.58, D2006 Enterprise.

Found the problem. It was caused by not having any printers installed.