i’m not sure if this is a rhino thing or a yosemite thing but either way, it can get confusing.
using the meshing dialog for example, it seems as if refine/jagged/simple aren’t available but they are.
MatchSrf looks as if everything is not available:
Sweep2 shows the problem best since is has a greyed out option next to a non-grey… (then black position/tangency/curvature)… seems like any active option should be black and only items which are actually greyed out should be grey.