Or our understanding of gravity is subtly flawed, and the quantum problems do occur on the macro level, or there's a mechanism that we just plain missed.
See, I'll buy that there's matter that phases through other matter. I mean assuming it doesn't have a magnetic field, the chances of actually impacting another atomic nucleus are actually reasonably low, so it could reasonably pass through most semi-dense objects.
The problem is this matter is going to tend to collect in very dense objects - stars, planets, etc. The fact that the stars we observe seem to have roughly the correct mass if they're completely composed of conventional matter, and that the dark matter we're looking for outmasses the conventional matter significantly argues to me that the entire thing is missing something. I mean we ought to be taking mass readings of our sun and going "that's way, way, way denser than we'd expect" in that case.
I've never seen a good reason why that would happen that way. If the matter exists, its going to be sitting inside stars, and the stars just don't appear to be gaining ghost matter that way.
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