In 2.0.1, if you have an offline map selected the application will not launch (endless spin).
to replicate: load an offline map, launch application, select offline map, close application (quit completely), try to launch application again (endless spin)
to avoid: select an online map before closing the application (quiting completely)
to fix (first launch quits, second launch works): revert to a 'clean install'/working Settings.archive (to get a clan one: backup app, offline maps, and system.db; delete app from iPhone; reload app onto iphone) or change whatever setting in the file that indicates the selected map