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We just became aware of this problem. Please logout of the app and then log back in and everything will work normally again. To do that, go to the All Yapps screen and click the button in the top-left corner of the header. A menu will open. In that menu click "Logout" - then log back in.
If you don't see a button on the left side of the header when you're in All Yapps, click the "More" button on the right side of the bottom navigation bar and then click "Logout" in the menu that opens.
If you wouldn't mind, please try passing this along to people so they are also aware of the issue and how to fix it. We're very sorry about this!!