There are definitely issues with screen / window drawing on external displays on Mac.
For me, clicking on a gear icon doesn’t show anything when the Rhino window is on an external display. This is also the case with fly-out toolbars - clicking the black triangle does nothing when the window is on an external display.
Dockable windows like the Block Manager will spawn on the Main display instead of the external display the Rhino window is on.
A container that is detached from the Rhino window can be moved to another display than the one hosting the Rhino window, but you can’t interact with it, it just disappears when you select something. It will, however, reappear when you click the main Rhino window and will respond to the close button being pressed.
I’ve also noted a bug back in October where dragging the Block Edit window to another display than the one the Rhino window is on will make it just disappear as soon as you release it! It’s “there” in that you can select it from the Window menu and then close it with Command-W, but it can’t be seen.
Version 8 (8.20.25140.13002, 2025-05-20)