I reset the camera, and tried that, and it still did not work. Then, I just hit the AF mode button (the one on the back, which you press first, before pressing M-Fn to actually switch modes), and moved the joystick. That worked. So, in most AF modes, you can just move the joystick, and the selected AF point moves. But in all points mode, you have to first hit mode, then use the joystick to move the AF point? Seems very tedious...
But, it does seem to work...mostly. It does initially lock onto the subject under my selected point...but it jumps a lot. As I track, it doesn't seem to really STICK to the originally selected subject...which is kind of annoying. I am not using my 600mm lens, though, so maybe it will work better on that.
What are your tracking sensitivity and AF point switch values?