We have had a number of reports of an unresponsive GUI from macOS users that also have a "window manager" app installed, such as Moom or Magnet. With Moom, disabling the Move & Zoom when dragging a window to a display edge or corner feature resolved the issue. For Magnet, we have not yet pinpointed exactly which feature is causing this so disabling the app is the only known work-around at this point.

We will keep an eye on this and update when we know more.