When I'm trying to take drills, sometimes the customize buttons like difficulty and status don't respond when I click them. i.e I'd click to select hardest passages only but the difficulty is still on any. And sometimes I'd get click start for a random drill, but it doesn't take me to the drill. Instead I have to exit the drill settings page, and go access the drill I just made in the "in process" section. Usually both of these problems could be fixed with a quick refresh of the page, but it happens very frequently and its quite annoying.