use libreoffice4.1 convert pptx to pdf

Dear all:
When i use libreoffice4.1 --headless --convert-to pdf,the ppt contains chart,but when convert to pdf,the chart missing title
there are two attachments about it,the first one is original file,the second is pdf file(the second miss title,e.g. FOB Freight…)
image description

How shall i do?

try to update?