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Hi Dan,
yes I created the definition entirely in Windows 7 version of Rhino5 first.

Unfortunately the Mac on which I was running Windows 7 via Bootcamp is now dead, and I’m currently using my wife’s Mac while I wait for a desktop refresh from Apple before getting a new Mac.

Hence my reliance on the Mac version of Rhino & Grasshopper currently.

Checked today with Mac GH latest build 5E292w and the problem remains.

I think this topic might be best merged with this one: