I have a problem with Motion Tracking in After Effects CS5.5. I pre compose the layer to add Motion Tracking and when i hit Tracking it opens the layer and all I have is a black screen. Here's an image http://imageshack.us/content_round.php?page=done&id=4tHcm52klZ-snK2Sn6OcoamWpZmZ3dbT
Your screen shot could easily be uploaded to this forum using the camera icon in the tool bar. I can't see your shot in image shack without registering. I don't want to do that.
Usually you motion track footage without pre-composing. It shouldn't make a difference, but there's not enough info about your project to know what may be wrong.