Is there a bug in the Rib command on Mac?

Hi, I’m having trouble with the Rib command on Mac, it doesn’t seem to work. The button is there, and I can select a curve to Rib but it doesn’t go further than that.

Can someone please offer some advice about this?

I just tried Rib in build 481 and it worked fine, just like Rhino for Windows.
I guess I’ll need an example from you.

I drew a Box and floated a circle over it. I ran rib, set a width that would not go beyond the edge of the box and chose the top of the box as the boundary. It worked just like it was supposed to.

I found a case when the Rib command would get stuck in a loop. This will be fixed in the next WIP release.