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hi,
as others have suggested, dither will definitely help, but I don't think that's the issue of your artefact.
I've done a fair bit of stacking in DSS without dithering but haven't seen artefacts like yours. its likely some setting in DSS.
Does the same thing happen with Median combine?
try a few different settings and methods and if you're not getting these artefacts in one or more of those methods, then its the stacking settings.
you can stack without dither but noise removal won't be effective. But doesn't look like you've dark subtracted anyway, so shouldn't be an issue.
are you able to upload a few raw subs in dropbox or other so we can try and stack as well?
btw, BackyardEOS 3.0.3 and above can dither with phd.
That's my personal preference for imaging with a dslr.
Cheers
Alistair
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