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When you click register checked picture, you may have set the percent to 50%. Also if it was set to 100% you may not have set the star detection slider to detect enough stars.
For some short exposures you may only need 50 to 100 stars to detect, whereas for higher exposures 200 to 400 stars maybe needed. Couple of nights ago I set to 80% star detection with 300 odd stars and at 81% had 0 stars. It is a fine line for star detection.
If it goes through the images and find too small number of star it won't register the images. That is all i know maybe another person has an alternative. I have only use Group 1 and Group 2 stacking once only 1 week ago, I managed to get all I needed.
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