Hello raglo,
Thank you for submitting your bug report. From your screen capture I can see that the top blue handle does not go all the way to the viewport's top edge and that the realtime sampling stops. It looks like KeyShot is hanging. This could be an issue with your current KeyShot version or with the graphics card driver (most hangs are caused by an outdated or unsupported driver/card).
Here are some things you can try:
1. Install the latest KeyShot update (8.2.80).KeyShot 8 – Mac2. Turn off Graphics Effects.Turn off “Graphics Effects” under Edit > Preferences > Advanced. Then, click Save Changes and re-start KeyShot.
3. Update to the latest Mac OSX version (Mojave).The graphics card drivers updates are bundled with MacOS X updates. KeyShot's user inteface (including the Match Perspective widget) relies on the graphic card for proper display and function.
Please let me know how this works for you.