Please note this is an old forum thread. Information in this post may be out-to-date and/or erroneous.
Every phpdocx version includes new features and improvements. Previously unsupported features may have been added to newer releases, or past issues may have been corrected.
Please run the conversion standalone. For example:
$ /opt/libreoffice4.3/program/soffice --invisible --convert-to pdf document.docx
The document.docx file must exist before running the command. And change the path to libreoffice before running it.
Note that LibreOffice can't be running when you invoke this transformation; so stop/kill every LibreOffice process.