I'm not sure if this is a bug but what I'm seeing when I remap an object is some of the points are being combined into one point making it impossible to separate them. I notice this the most when I'm remapping something like a hand-rail. I'll remap the rail so it completely covers the texture so I can do shading (without baking) and even change colours along a railings length. I used to be able to get every point discretely up until 7.x came out. Since then I've had occasions where no matter what view (face, world, object etc.) if one point is behind another, the mapper seems to see these points as one.