hi,
I was trying to append a Group which contains my model and rig from another file in to the main file but on rendering it causes errors on the surface of the mesh in BI on linux/Centos 6.3 32 bit. It could not be rectified even after changing the materials, normals, textures. I am uploading two files one contains simple objects in a Group and other contains a simple code to append the group in to main file.