Might be a bit too soon here since the service just came back up from the *massive* update today (rain is awesome, BTW), but SC4.5 doesn't want to engage with the exact same settings as the last 3 months. Never get the voice 'car and track settings found' when loading into a car.
Had to bail out of race setup and call up one of my old pre-cloud tuning profiles and it attached right away, but tough to race like that.