Hi,

I am making animation and use quality firefly rendering IBL lightning.. only 2 light.. My problem is, sometimes some of the renders got corrupted shadows.. sometimes many of them, sometimes few here and there. Sometimes it renders well the whole project. I mostly render 500-1500 frame at in a raw. Corruption is not depend on frame numbers, it could be at first renders too.

Here is 2 type of corruption at shadow at same animation and correct one.

I got this error at older posers too. I am using pro 11 now. So what could be the problem here? What can i do about it? It ruins my hours of rendering.. thx!