If you are booking out more than 6 days out (which they advise you to do, to get the classes you want and not have to sit on waiting lists constantly) when you hit the back arrow to back out, the app refreshes back to the first 6 days, not to the day on the calendar you were just at. So you have to scroll to the bottom, wait for it to add the next 7 days, then scroll again, wait for the next 7 days, etc., etc., and do this over and over to get all you classes booked. The app should be smart enough to return to the date you were just booking. Similarly, when you switch to another app quick (like your calendar, to check your availability), and then switch back, the whole app has to repay again. The front page takes awhile to load, then the calendars take awhile to load. The app should just pop back to where you were when you toggled out of it.