Blender 2.67RC freestyle problems

Hi all,

A couple days ago i got the release candidate build for 2.67. and first off, i gotta say i love it! I enjoy how fun and new freestyle is for me but i have a problem with it. when i first render the image, everything looks fine, as denoted in picture 1

However, when the picture is exported, it looks as though the freestyle lines were not saved in the image, and i am not sure why this is so, as denoted in the second picture

Any helps at all as to why this is would be greatly appreciated!