yes, I can supply a couple of raw images that were troublesome.
After conversion, if I try to register the whole image, the light pollution dominates and registration finishes without error, but the starfield is not aligned. If select a box around the darker starfield and select "match stars in selection" , registration fails with "cannot perform star matching".
If i convert to tif, and mask out all but the darker starfield, registration succeeds.
Where can I upload the raw files?