I’ve found a problem with Rhino 6 on macOS Big Sur. When I try to import larger libraries of hatches such as the one provided in the Rhino FAQs or acad.pat, the program completely crashes and is unresponsive.
I go to File → Settings → Hatch → Import and pick my file, then the crash occurs. It looks like the preview import window wants to pop up, but it only appears as a see through rectangle where the window should be (see file below).
Alos, if I click into the main Rhino window and click any of the menu bar items such as File, Edit, View, etc., instead of the drop-down menu, the same see through window appears.