I think I’ve figured out whats causing it. It’s when I try to reject some at the stacking stage with wfwhm. If I just let it use them all its working.
Can you share the log still?
Same for nbstars or roundness so probably anything other than all.
2025-05-15T11.01.19.zip (11.4 KB)
It looks like its the combination of having feathering along with some sort of image rejection criteria. Feathering works if I don’t add my wfwhm.
Ok, clear. Thanks for testing and for the log, i’ll look into it
Thanks again 
Issue is now fixed : Stacking: Feathering fails if filtering criteria are selected (#1629) · Issues · FA / Siril · GitLab
Will be available in beta2
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Fantastic