Hi Two bugs:
1. anyway when visibility is set to 0 octane will not render an artifact of two objects being in the same space. I know rendering unchecked fixes it but we have to use visibility because the way chunks of stone disappear during shooting. Thanks
2. When pflow is used or this particle system like in the scene and vertex MB is on these strange lines appear even though particles are not there. Please try the scene SPARKS MB BUG.max frame 95 thnaks