Update: 6.3.22 Resorts to black blank screen when used in conjunction with Messenger / Words with Friends. Uninstall / reinstall cannot be the way ahead folks. Is it the advertising???? Unpredictably odd. The web version seems quite stable but the phone app of recent has become unpredictable. Sometimes you can easily log out and sometimes you can't or you suddenly have no graphics whatsoever. Perhaps it requires more time devoted to app stability and less time to the advertisements.