from what we can guess, its possibly because you don’t have any of the autodesk materials installed. Our exporter relies on the render api of revit and when rendering is disabled, it won’t work. Can you render viewports in the “realistic” mode in revit? If render features of revit are disabled, that might explain it.
The other thing is I’m operating revit via mstsc (remote session via microsoft’s rdp ) so was thinking that might be it.
I’ll check with the autodesk materials though,
Probably should’ve done that first off but that’s the solution if anyone looks this thread up in future. It’s a real pain to install Revit but it fixed the issue whatever it was.