I ran in to an odd little routing behavior on the iphone beta (22.214.171.124) today. It looks like the turn-by-turn panel stopped updating. I'm not sure what caused this. I sent in some logs about and hour or two before this post.
The turn indicator shows a right turn, but as you can see, the road here is not the road indicated.
Later on the same route, it is still frozen the same way:
Strangely enough, the distance has changed, so maybe the text did not update, even though it is still routing to the next road.