App Switching on a macOS 10.12.2 Login | Register | Lost your password? Home › Forums › Support › App Switching on a macOS 10.12.2 This topic has 0 replies, 1 voice, and was last updated 4 years, 3 months ago by zie. Viewing 1 post (of 1 total) Author Posts January 2, 2017 at 17:41 #21979 zieParticipant Hi, a few things on macOS 10.12.2 (Sierra). 1) the icon is a black box(i.e. a unix app icon) 2) If you Alt-tab(app switch) to a different app/window, and then try to switch back, no window is displayed. This second one is definitely an issue, and very annoying. Please fix. Author Posts Viewing 1 post (of 1 total) The forum ‘Support’ is closed to new topics and replies.