Tracking a point, play button has disappeared
I was tracking a point in a composite shot, but now the play button has disappeared (also pressing 'space' does not play).
I tried closing and restarting the program, but it's still not there.
How can I reset the UI and get the play button back?
How can I stop a point from tracking?
This happened because I only wanted to track to half way through the composite shot, so I closed the 'tracker' pane.
My UI looks like this: