I used MM a couple of weeks ago to create some mind maps. I upgraded to Catalina after that but then could not open them using "Map Chooser;" I can click on the file name, but the Choose button remains greyed out. I am able to select the file via Finder. When I do that, the window appears with a blacked-out screen. Then MM crashes. I completely uninstalled MM and reinstalled, but no change. I only have 7 days left in the trial before I decide to keep it or not. I am using v12.1.190. Catalina version 10.15.1.