What the heck are these and how did this happen?
I just rebuilt a duplicated edge, matched both ends and then inserted a new control point and now I see this…
ghost-control-points.3dm (880.2 KB)
Sub-D friendly…?
No idea how that would have gotten in there, but also no idea how to get rid of it.
Weirdly, I just matched it with trangency to the end a temp curve, and now it looks like this:
So it moved the control point under the ghost point, but it still left the ghost point? It’s not locked either… no idea what’s going on (and of course, I can’t rebuild because that screws everything up).
MakeSubDUnfriendly…? 
(actually it’s called SubDUnfriend - no idea why.
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Holy shit, that was it. WTF!?