Irradiance map animation problem-black geometry

[skeay]

Looking for assistance on an animation I can't seem to resolve the errors I'm having. I've attached a gif which shows the trouble if this doesnt work theres also a still attached.

 

I'm using prepass ir calculation with & it generates these black blocks of geometry.

I've checked & replaced the geometry with the same trouble, renders are fine on a still shot.

I can render with brute force without this trouble but with own set of troubles inc heavy render times.

Any thoughts very welcome!-Thanks

[Francisco Penaloza]

are you using Irradiance and Light cache? is light cache set to world scale instead of screen?

Do you have any dirt material or edge text applied to that surface?