Hi Michael. Since I am now a Beta Tester for Rhino OSX, I used that for the conversion. Worked like a charm! I just choose "R12, lines and arcs" as my export option.

I noted that export from Rhino OSX for use in Moi must be as a Rhino v4 3DM file, as a version 5 file comes up blank in Moi.

Cheers,

Chris