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.
In my document, the text is highlighted too.
But it uses the background color option instead of the highlight option
http://imagizer.imageshack.com/img901/9434/FT4cbb.png
Regards