Shift not alt.
If that simple approach fails, you can always parent trackers or blend results of multiple tracks...
Okay, I tried holding shift with five or six attempts times and the object that I attach to the tracking data jumps from one group of data point to the other. Can you explain how you do this? I assume you hold shift before you grab and reposition the tracker. I tried grabbing the tracker and then holding shift too for good measure. And I could parent multiple tracks together but was hoping this method might work first. Could it be a preference setting?
Anybody want to take a stab at this one??
Personally I would use Mocha. It's going to do a much better job in less time and objects going out of frame are not problem.
If you must use AE's tracker then you want to move the tracking area by holding the Alt/Option key while dragging after the cursor changes the the cross in the center of the tracking area but not while over the attach point.
If you need to adjust the attach point then do not hold down a modifier key, just hover until the cursor changes to a smaller cross with kind of a white outline. Big cross moves tracking area, little cross moves attach point.