Effect not visible, a white plane only.
Sys. specs. :

Look at my sign

A6 version :

Commercial 6.60

Cheers

Frazzle

Antec® Case
Intel® X58 Chipset
Intel® i7 975 Quad Core
8 GB RAM DDR3
SSD OCZ®-VERTEX2 3.5 x4 ; HD 600 GB
NVIDIA® GeForce GTX 295 Memory 1795GB