flickering render

[superhypersam]

Hello all,

as the title states, im getting flickering in my renders, if I look at the images, frame by frame, i see a distinct density change on each frame.

I am rending localy,
Max 8, sp3, fume 1.0a
win xp 64
Intel zeons dual core
4 gig s ram

using the dcp flicks lic server, everything seems to set up correct.

any ideas, dealines a' looming!

cheers

sam