This is another speed bump I ran into when trying to create a print server. Ghostscript won't accept an output file ("/OutputFile" parameter) with special characters. Ghostscript will output a "Unrecoverable error, exit code 255" error and fall down on the default print dialog. If you're running PDFCreator as a service, this is very undesirable.
To fix it, just rename your printer to something with normal ASCII characters and you're set. If the problem persists, restart your spooler service.
You can check if your system has any printers with special characters in the SetupLog.txt
Leaving this here in case someone might find it useful.