Man I love online forums. Came here to find out why registration wasn't working, left here finding I've been stacking images wrong all these years. Turns out if you have an overscan in the frame you need to define it so that Pixinsight will remove the overscan component from the bias frame before creating a bias master. This may be why I had those problems with pixinsight inducing noise when stacking last year which was solved by creating some 100 bias frames...
Thanks a lot Rick
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