I had Garmin MObile XT version 50010 and it was very good. I then upgraded to version 50020. Then I got the same things that you are saying here. It is like the grafic is to slow. When you got to a turn, the car is stil a step away from the turn.(I have a Nokia E66).
I have gone back to version 50010 again. Just used it today, and it is working very well. No grafic errors or lacks. It is fast and good.
So my advise is - go back to version 50010.
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