Hi
There was a problem executing the bevel command object subd
Rhino 7 SR0 2019-10-22
@BrianJ??
That’s on the list as https://mcneel.myjetbrains.com/youtrack/issue/RH-54109
InsertEdge with Bothsides on and then deleting the original edge loop may get you there in the meantime on SubD.
Related: “delete input” should be an option with inset edge both sides. Similarly, delete input should be an option with inset N-gon, or right click for inset n-gon should be _insetHole
SubD support for Bevel is added into Rhino WIP. See Bevel for SubD.