Isn't this basically the same question that was answered earlier in this thread??
Or are you saying that now you are doing NO background calibration and still having noticeable color shift in DSS?
You are right. My apologies; I'm still wrapping my head around all of this. Imagine you told a "regular" photographer, not an astrophotographer, that you could reduce the noise in his photographs by stacking a bunch of exposures taken rapidly. That sounds interesting, he says, tell me more. Then you stack his exposures and the whole thing comes out puce. Oh, you just have to fix the color balance! But the color balance was fine on the way in? It's just very non-intuitive for me. Again, my apologies. I'm sure I sound like a repetitive idiot.