I'm pretty sure this is a bug and it's easily reproducible. Create a line; select Modify/Rendering/ Enable in Renderer (but not Enable in Viewport). Render it using vray, and it will automatically toggle Enable in Viewport to On. This doesn't happen if you use the scanline renderer, so it appears to be a vray issue. It doesn't seem to happen with other splines just line, and it doesn't seem to matter if the line is a closed or open shape.
3ds max 2017, vray 3.40.02
3ds max 2017, vray 3.40.02
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