As requested, I am starting a new thread on this problem.
This was my original comment, made in the "New update 17.1 available now! " thread:
Since the update, the spoken instructions at roundabouts always say 'go around the roundabout, xxxx exit'. We used to get instructions such as 'go left on the roundabout, xxxx exit', 'cross the roundabout....', etc. These were far more useful. Why has this changed? Is it a bug? If so, how soon can we expect it to be fixed?
Regarding what type of roundabouts this occurs on: So far it seems all roundabouts are afflicted by this, from the very simple 3-way to more complex, multi-exit ones. It's now impossible to determine, by voice instructions alone, which lane to select when approaching the roundabout, and requires that the driver looks at the tomtom display, so this it a significant safety issue.