Altium 10: Tracks not sticking to pads

I am routing up a PCB in Altium.

After I have snapped the routed track to the centre of the pad everything seems fine….

-I am seeing the “octagon” appear to indicate that the routed track is at the pad centre and ready to be terminated there.

However, when I subsequently move the component a bit, the route does not move with it, but just stays where it is , and does not appear to be connected to the pad.

Why is this?

How can I make the routed track actually connect and “stick” to the pad?