I don’t know if this is an intended function or I have to activate a function, but I was trying to create a line snapping to a point that is on a surface (point is independent to srf.) while on the shaded view, which is perfectly doable in Rhino 5, but the snap didn’t work and had to switch over to wireframe which was kind of annoying.
Can you post a small file that exhibits this issue please?
That’s probably a side-effect of the new option to prevent snapping to things that are not seen. When a point is on a surface, the mesh might be just over the point, making it impossible to snap to.
See if unchecking
Rhino Options > Modeling Aids > Object snaps > Snap to occluded objects helps.