A possible bug with SSS and ray shadows.

Support Materials and Textures
1

When I take a spotlight or area-light with ray-shadows. I get an error. If I render just a part of a area. It renders ok. If I render whole image, the SSS turns black.

Here are the example.

http://i35.tinypic.com/1rdsly.jpg

I am using blender 2.48.