Motion Tracking: Analyzes only first 6 frames

Hi,
I using the FCP "Send to Motion project" command on 2 clips (1 HDV video+1 still. I tried with various material and various FCP sequences and I always end up having a weird problem and maybe someone here can tell me what I’m doing wrong. I set the in and out at the beginning and end of the clip in the Motion timeline (actually, they are set as such by default). I apply the Motion tracking behavior to the still. When I click “analyze” in the Motion tracking Hud, it analyzes the first 6 frames and then stops as if the task was complete. I tried starting from the end instead, it did the same, analyzed the last 6 frames only. In FCP, the still's duration is the same as the clip underneath, same thing in Motion 3.
Any idea what I’m doing wrong?
Thanks

It may not be complete - Motion may have lost the tracking point - perhaps it moved too far between frames.
Patrick

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