1. You have to attach the object to the motion path in order for the start and end frame numbers to show up. Also, be sure that it is set to START/END" in the option box.
2. Maybe a video issue? It normally updates when you move a keyframe in the GE. This is the first I've heard of this. What are your system specs?
Professor of Digital Arts
Digital Media Arts College
Boca Raton, Florida