Rendering problem: the screen appears black!

I have 3dsMax2010+SP1 and Vue 8.4 xStream.
I have made in 3dsMax one architectural scene; I have used a mrProxyObject for the elements of the high detailed roof.
I have used Vue to create the natural environment with Terrain, Plants, Bushes and Flowers.
The problem in 3dsMax:

• At frame 413 of my rendering, the screen result, and also the FinalGather Pass, appear completely black!
• Next, after some keyframes the rendering becomes correctly, and after others following  keyframes, the rendering returns to black!

I have checked others camera views, and the image at frame 413 is OK.
Just the "Camera01" appears black, and also when I convert this camera to "Perspective" viewport and render it, the image is black!

I am desperate to understand what is my problem, and I don't know if this is a problem of Vue rendering engine, or a mentalray-3dsMax problem!

It can be also an occlusion object problem, but I am not sure:

• I tried to move the "Perspective" camera viewport a lot far away, but the problem persists.

Any suggestion?

Many thanks!
Horsepower0171.