Rhino6 to Rhino5 for Vray Rendering


I saved a few files from Rhino6 as Rhino5 file. To Render it with Vray in Rhino5. But everytime I start the Rendering it just get’s all black. Tried it with same Settings on another Rhino5 file and it worked.
When I copy the whole geometry in a new Rhino5 file everything is working. Somebody know what happens there? Is there a way to fix this?

Best regards,

I’m not a Vray user…
When you save your RH6 file in RH5 format, the groundplane is automatically turned on. Is this something that might be getting in the way?

Don’t think so. In rendered viewport and with the Rhino renderer it everything ok. Just Vray got a Problem with it.