I have stared to have a problem with the focusing with the new version 184.108.40.20672 and before it was great and always worked well. I am posting this here because it looks like the same problem.
I set it on a focus run, it takes an image and plots the point on the graph at 0, and keeps doing this for a few tries, just adding points to the zero. After a few of these points it changes the focus further out and repeats the process, each plot is on the zero. Again after a few attempts it moves the focus point even further out, and it seems to do this till I cancel.
While it is doing this, there are no stars selected on the screen and therefore no measurements made.
The only way to get it to focus is to close down SGP and re-run, usually it then works. But even when it has worked, a bit later it fails again and a re-start of SGP is needed.
I started to make a AF pack, but all it was doing was saving lots of these blank images, which would have been a huge file size so I stopped it.
The images displayed on screen initially show out of focus stars as you would normally get (but without the measurements) And as it goes on those stars get more and more out of focus.
The initial focus is being done right after a manual focus with a Bahtinov mask. So it does start off in focus.
Using Windows 7, and there are plenty of stars in the image.