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Yep - I see them now - thanks Carl. Although I think they are still there in the Eta image - just camouflaged by the nebulosity. I would be leaning towards reflections also Doug - isn't dust usually a dark blob?? Although you might have left something behind on the objective when you cleaned it - especially if you did your flats before the subs as the flats would then not have picked it up.
Also Graham - it looks like you might have some issues with your sensor being not quite square - look at the Eta image - the stars in the middle on the right side are tightly focused with a progressive blurring and elongation towards the left.
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