Also here is a demo of how to align 2 images with one another when the second one has just been initially placed quickly in the Front or Right-side view:




One key thing to notice there is that I grab the upper-right scale corner, and not the lower-right one.

That's because the anchor point is mostly what you want to control there - if you look closely when I move the mouse over the grip, you can see this anchor icon that shows where the fixed point for the scale is at:



The anchor for the scale will be the opposite diagonal corner, so the grip that is diagonally opposite of the point you want to stay fixed is the one that you want to drag, not necessarily the one that is actually closest to your final destination point... That may be a little trick that was getting in your way.

In v2 you can also click and release on one of those corner grips to switch the anchor from corner to the center of the image. So if you see it go to the center, it means you did a click and release on the grip, and do another click on it to flip it back to corner mode again.

- Michael