The manual states that showing the box over the tracked target via PTRK is not included yet (Chapter 12.7.2.3, Page 426, marked yellow). Maybe that's why?
Working procedure for me: CDES boxed, ALAS and PTRK selected, then put the crosshairs of the Pod over the moving target and if the contrast is high enough they will snap onto the target and start following it. 100% hit rate as long as I dont wiggle around to much so the Pod looses track.