There’s a super annoying bug in the latest release of Rhino 6 for Mac (6.19.19266.14182, 2019-09-23), where Rhino can’t be hidden or minimised to the dock, when Grasshopper has been launched!!!
To be clear, Rhino works fine. The bug only happens when Grasshopper has been started.
It doesn’t matter if the GH window is closed, minimised or visibly open! If I manage to minimise or hide Rhino at all, it immediately pops back up with a blank GH window that only reloads when you click on it.
Most of the time, trying to hide it simply pushes Rhino to the background of the desktop, for instance behind Chrome. Oftentimes, the GH window gets placed even behind Rhino.