Vertically-written Japanese documents cannot be converted into PDF file using doPDF.
The sizes of the created PDF files are 0 byte.
There are no problems in conversion of horizontally-written documents.
This problem seems to be happen only in the documents written in vertical text direction, and Japanese language.
I'm glad if you will fix this problem.
I am using doPDF 6.3 build 308, Windows Vista and MS Word.