Had the issue only ONCe - and it was entirely the CAMERA fault, and ine - I had selected a hot or dead pixel - the dark subtraction didn't remove it. So, of course, running the routine, it did NOT move. LOL.
Now I use auto-select most of the time, and defocus and refocus the cam JUSt to be sure it's a star
And, despite what a LOT of others say, I find if I do NOT set my refresh to BELOW 1s, I get pretty average results. I usually run it at 0.2s refresh, and get GOOD results, and still acceptable star illumination MOSt of the time (I just move the guide scope if there is not one bright enough at 0.2s. Now, I have been told that that can be BAD information, so use it at your own peril
Whatever works I say.