Attached Link: http://reddog3d.crosswinds.net/volume.htm

Yep, exactly as Guitta shows (and it's Greg ;-) I too have several scenes that illustrate the problem. Let me know where you want me to send it, and it will be on it's way. As Guitta said, it was reported back in October when patch update to 4.03 came out. You can also check the link to see some of the other oddities I have some across when trying to work with the volumetric lighting.