"invalid cache light sample"

[urbanite]

Hi

I have opened 3 years old scene as the client want to do some adjustment and I am getting this info in vray message tab. Also DR does not work with the scene. I have reset the scene going to scanline and to vray engine again. DR would be quite handy with this project and I am not sure if this is or could be related to LC error.

[svetlozar.draganov]

Do you remember with which V-Ray version the scene is built?
Except the LC error, do you notice any other issues in the final result like artifacts,blotches etc?
Does the DR work fine if LC is disabled?