I'm running the current CVS version with the following
USE_EXTERNAL_HTML2PDF
USE_EXTERNAL_HTML2PDF = "C:\Program Files\Easy Software
Products\HTMLDOC\htmldocd.exe --quiet --format pdf14
--no-toc --no-title --no-links --webpage %s"
Note: when run from the command line against a phpwiki
html dump file, this DOES create a valid pdf.
If you attempt to create a PDF via phpWiki, no page is
returned.