Display Modes Bugs ? Lights, Shadows and Ground Plane

I’ve been experimenting with custom display modes these days, and Rhino seems to behave in a way I wouldn’t always expect. Lots of issue come often (sorry I don’t always take the time to document, mostly when they’re really too obvious), but here are the two I’m having lately :

  • Shadow on the ground plane : It’s sometimes offset or jumps unexpectedly (see video). Looks like a bug.
  • Lighting mode : I’m using a custom lighting setup (see image), but the light rotates with the camera instead of staying in a fixed world position. Is it a feature or a bug ? I personnally find it quite annoying, and it is not what happens if I use the same lighting and Scene Lighting mode.

Has anyone else run into this or found a workaround?

Edit : attached is the Display Mode to see if it’s reproducible.
FC-Simple Shaded.ini (30.0 KB)