Well, that's probably because the printer doesn't know it's position yet. What happens if you click "Home All" on the Jog Controls tab? At that point, the printer will go to it's known origin, so I would think it might update the position.
Anyways, it seems to work fine once your printing or moving around, so I wouldn't be alarmed if it shows 0,0,0 at the initial startup. Just home the axes if it really bothers you.