Vray 3.6-3ds max renders black

[joshua97241]

When I start rendering with my scene with vray materials and lights, the frame buffers starts to render black even adjusting all the possible parameters that affects the light. There is a time, like twice, that when i render the scene, it renders correctly the way it should be rendered but most of time it renders black. Dealing this problem for a week, yet can't figure out how to solve. Please help me. (Please see the photo.)

[nikolay.kusht]

Could you send us your scene to support@chaosgroup.com so we could further investigate your issue.