black spots on animation with the distributed rendering

Hello

my name is Leonardo Ricci and this morning I bought your script.
Now I'm testing him and there is a problem. With the distributed rendering a static scene, no problem, but I noticed black spots on animation

Why is this happening?

I sent two pictures

Hi

so this is the problem. First my scene is in millimeters with the room (5000x5000x3000) mm and the sphere is 350 mm.

In static scene with DR ok (everything is sharing in network) everything works fine with all qulity settings.

In animation with DR deactivate everything works fine with all qulity settings.

In animation with DR activate the image is ok with a quality "preview" and "low"

In animation with DR activate the image is bad with a quality "medium" and subsequent

I sent the images and the file

thanks

leonardo ricci