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OK my poor old head is starting to get around some of this. Registration is just that: aligning the frames or rather the stars in the frames. So Alex and Raymo you are right: changing the registration threshold has no effect on my stacking problem, despite the cryptic message from DSS on the "only one frame to stack" warning. The second part of that says "and help DSS find a transformation between the reference frame and the others" which is Greek to me but seems again to apply to registration only.
So, if I stack the one frame I find the RGB/K window shows an S curve and a tall, narrow bell curve right at the bottom left hand end. If I move the bell curve up to the lower point of inflection of the S curve (which is my standard practice with stacked images anyhow) extra details pop up (which is the standard result).
All of which brings me back to the original problem: the registration process has not found enough stars to allow the stacking process to proceed. Is this perhaps a "fail safe" function to avoid stacking possibly misaligned frames?
Thus my question: can I override that and stack more than one frame because visual examination of the individual frames and the registration scores (low as they may be) does not indicate any alignment problem.
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