This is a new one. Out of nowhere when I open NSBasic, the icon bounces, the splash screen appears, then nothing. When I right-click on the icon in the dock, and select “Show all windows” it appears as a lone blue-framed app with no other apps. But when I click on it, it disappears again down in the direction of the dock icon. Have rebooted Macbook, reinstalled Appstudio, and tried an older version of Appstudio (9.0.2). Nothing. When I open Mission Control the app is shown, but again clicking on it makes it shrink into the dock and disappear. Has anyone experienced this? None of my other apps are doing this or have ever done this.
Must have been a MacBook / screen function thing. Still don’t know what happened but creating a new screen view and dropping it into that view seems to have fixed it.