I'm using AE Beta 24.2.0x66.
I'm currently waiting for some tracking to complete on a ~30sec clip. The track points have gone way off, but there's no way to cancel the tracking, regardless of what I press/click. Clicking the 'stop' icon in the Tracker panel does nothing, hitting Esc does nothing...AE is completely unresponsive, but is continuing to do the track (even though the track points are totally useless).