Grasshopper objects displaying while grasshopper not running

I have grasshopper scripts that use the ‘Custom Preview’ Component.

In Rhino 6, when using Arctic and Rendered display mode, the grasshopper geometry previewed using the custom preview component is visible even when grasshopper is closed [ie. the script is still open by the grasshopper window has been dismissed].

This creates z-fighting glitches in the viewport when there is also a baked version of the same object.

Normally I would expect the grasshopper geometry not to be shown in the viewport when the grasshopper window is closed

Does anyone have any ideas why this is happening, and how to make it stop?




In rendered and arctic the meshes are added to Rhino semi-permanently, you’ll have to actually close the document or disable the custom preview to make them go away.