Deadline 3DSMax, Vray and Fume problem

I seem to have a problem with deadline and rendering with vray/fume

I have a dummy scene with an animated block, if i sent this to dead line to render 10 frames with Vray all is good, both of my machines split the load as expects and render 5 each.

However if i open my new scene which has a fume grid and render a frame with Vray from the dialog box in 3DS Max, it renders ok, takes approx 1 minute to render out, however if i send the same frame to deadline, it just previews a black screen and runs for over 20 minutes before i cancel the job, any idea what might be happening?

Andy

Will continue this via ticket sytem