2.63 weird rendering bug...??

This image captured from our current project. The character model was modeled in separate .blend file complete with rig then group linked to new .blend file for layout, lighting and animation. At current stage the group just linked so there’s no proxy rig.
When I test render from Camera view, it looks weird in render window (as in screenshot)… Nothing weird with the rig itself…

Are someone could help me solved this problem please…?

Sorry, I cannot post the .blend file because it contain some .blend files and the project not finished yet so I cannot publish the files…

Thx b4