Have to the close and reopen. Happens most when I'm typing replies on the forums.
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[b]iOS[/b] From the main screen tap the Menu button in the top of your application, choose "APP SETTINGS > Delete Cache . [b]Android[/b] From your device's Home Screen, enter the Settings app. Choose "Apps", go to the "Downloaded" page/tab, select "Destiny" from the list and press the "Clear Cache" button.