xthestreams wrote: Fascinating! Well it's not mirror flop then!

Could you screen shot your settings and share - this is interesting!

I could not completely duplicate this last night but have some interesting results.

First image is a first attempt and worked. Notice that the selected area is square.
The next image shows a later attempt which also also worked but notice that the selected area has become a rectangle.
The next image is another attempt that shows a selection problem. The area is again a square and it has chosen an area around a valid star but has selected what I recall was actuall two stars away from the centre. It was actually able to focus using them, but is not ideal the central star was probably the best to focus on and must have been what was used to define the square.
The fourth image clearly shows two stars selected which are not the centred star.
The final three images show some of the settings.

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