Did you save the file after the change to shadows only? I think so but the video was too low res to see. I haven’t been able to reproduce this either yet here but will try again.
Do you have multiple Rhino’s open too? This hasn’t caused it to happen here but just checking.
Thanks, I tried the same but can’t reproduce what you showed. I wonder if it has to do with any specific block or Plist setting (your Rhino for Mac preferences file). Have you tried resetting the Plist? You can make a copy of it first so that you can replace it again if it doesn’t make a difference. Here’s the info on how to find and reset your Plist file. https://wiki.mcneel.com/rhino/mac/resetprefs
If you can post the actual block you Insert as well, I can try that too. Thanks.
I tried the steps mentioned above, but issue is still here. Furthermore, after resetting the Render settings Rhino freezes every single time (after 10-20 seconds).
Here are some steps to reproduce this issue, took me some time to distill it to its minimum:
Open a RH file with two boxes (ground plane settings will probably be lost = white ground): Model.3dm (3.0 MB)
where other two boxes are inserted as a Block: Block.3dm (2.8 MB)
Make sure the background is set to Application settings in Rendered Preview: