visible, invisible vraylights

i have a problem with spherical vraylights, which are set to invisible, showing up as dark circles on my render…
http://www.littleminer.com/getimg.php?img=vraylights.jpg

oop. p.s. its 1.46.14, max7, xpsp2, dual xeon 2gb etc.

(not really wanting to swap in mid project, had problems with 1.46.15, and have a lot of animation to do in the next week or three, so 1.47 is out for now.)

i have found 1.47.03 is quite stable

can you send me a scene?

ok sorry for the delay, ive been up to my eyeballs in work.

turns out the bug is due to using an environment fog. if i disable the fog, the lights become invisible once more… ill send you a test scene to show what i mean…

well even though ive tracked down the cause, its still a bug!

note that they also show up in the alpha channel, and are shaded differently to the rest of the scene.