On the Video FX Pan/Crop tab there is a little dot inside the frame outline you can move around and it shows the x/y coordinates. What is it for? I can't see that it ever alters any behavior. Is it just for finding pixel coordinates?
That's the "center", for when you perform operations that are balanced around the center. You can change the center to any spot in the frame you wish. Rotations also revolve around this dot.
Oh yeah! And if you then grab hold of the frame and "revolve" it you can go forwards or backwards and keep on going! Go through 360 degrees and onwards - through 720 and on and on ... and on .... and on! You will see a little "clock type thingy that will show you how many "revolutions" you've "clocked-up" and have gone through. And yes.... you've got a revolving clip - this is amazing stuff! This s/w package just keeps on getting better and better!