My only issue with drive detection after the update was it turning on and off while driving. Seems that different types of vibration make the thing think you're not driving anymore. I adjusted my mount with a different length arm and solved the problem. Also setting it on the seat next to me or in a visor pocket solved it as well (which is how I discovered the mount was the problem).
But if it is simply never coming on for you I think you have a different problem.