Confirmed bugs in Version 5.5.0 should be fixed in the Version 5.5.2 update for iOS. Please update your version by 8/12 12AM (ET), as you'll be prompted to update after 8/11 11:59PM (ET). Remember to update in a location with a stable connection and wi-fi.
*Android users are already using Version 5.5.2. There's no need to update.