To the OP, exact same is happening to me. I found a workaround, once you arrive if the start trip is still gray, back out of app and go back in, instantly turns to green. This is happening regardless if destination has been entered, originally though that was the prob but it happens sometimes even with destination entered. It does happen always, it is intermittent but has continued since this week's update. Obviously some kind of bug with certain android setups. Hopefully this will help you until the "tech" company we don't work for fixes this horrible update.