Hi @arcus,
Sorry for the late reply. VisualARQ doesn’t support yet the V-Ray’s interactive mode.
This has been already discussed here:
https://discourse.mcneel.com/t/vray-interactive-render-problem-with-visualarq/
https://discourse.mcneel.com/t/vray-interacive-render/
You are right that a workaround is to hide/show, update, move, etc, the existing objects.
New inserted objects during the render session will be visible.
We will let you know when this is fixed.
Kind regards