Yes I was using the demo scene files in my tests

but now I have tested with a obj file exported from Rhino
and all works fine

thanks for the help

gerry

How do I get to start a render ?

Ok I have a quadro FX 1700 and installation
was Ok after upgrading NVIDIA drivers .

I have loaded a scene file and clicked on the mesh node
and Now ?
Nothing happens, the render icon is disabled whatever i do

In my preferences I see 1 Active device ( 0 ...