I just got Basecamp for use with a brand new Zumo XT but unless I'm missing something really basic, it is completely unusable for, well, anything. I can't search for ANY addresses. If I zoom in to try to pick a point, the map completely disappears at anything less that 50 miles wide views. It is utterly unusable so, tell me, what am I missing here? I need to be able to define intricate routes for my XT but lacking a functioning interface, I can't and will have to return it otherwise.