If I select Mesh_26 on a layer 1 above the bottom of the Layer Panel by clicking on its light bulb, it lights up the light bulb and shows the mesh in the Rhino window.
But if I click on the light bulb for Mesh_27 layer at the bottom of the Layer Panel, it scrolls the layers up by 1 but does not light up the light bulb or display the Mesh.
I am not aware of just selecting the layer making it also visible (light bulb on). Only actually clicking the light bulb should toggle its state as far as I know. That is at least how it works here on my M2 with Rhino 8.
I think what Terry is saying is that if he clicks on the lightbulb of the last displayed layer it does not turn on the bulb and display the layer contents, but instead just scrolls the list upward by one.
This behavior is a departure from the behavior in response to a click on the lightbulb of any other displayed layer in the list and is thus unexpected and unusual behavior. I don’t think he’s complaining about the gratuitous upward scrolling of the last item, which is handy and makes sense. I think his issue is that the click on the lightbulb doesn’t do what it does on all the other layers shown in the list.
I would call it a bug - maybe only a bit more than a “paper cut” - but a bug of the developer oversight variety nonetheless and trivial to fix.
On my system with Mesh_27 layer (equivalent to your Mesh_46 layer) fully visible, the errant behavior is manifest. Partial display of the layer is not required in order to observe this behavior on my Windows 11 PC. So the title of RH-84384 may be inaccurate for those with Windows 11 systems. Does your PC use Windows 11? Since it is an M2 the answer is probably No.
It would be good to get input from other Windows 11 users.
@AlW do you have a Windows 11 system? If so, could you load up the .3dm file and give it a try?
