I want to make sure I understand what you are saying...
So you pair with sync and you no longer get voice directions with Nokia drive? I certainly do, so if that is what is happening with you, something is definitely amiss. I can take voice calls, and I even have my texts read to me as they come in. My only issue thus far has been seeing bluetooth music data on the sync screen. I would like to see artist and track names if possible.
Is your sync software up to date? If you don't know, log into synmyride.com and find out.