Hi Randy, I sent you a reply through e-mail, I'll also post it here:

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Hi Randy, there may be something wrong with the file, I tried to open it in a different CAD program called ViaCAD and it also had a problem with that exact same surface there too.

Rhino did seem to be able to open it ok though, so I’ve attached here a 3DM file saved off from Rhino, hope that helps.

Other than that, Moi v3 does seem to read more of the file than MoI v2.x did although it still has that one surface messed up. But there are all sorts of various fixes in v3 so it is probably worthwhile to update to v3.

Thanks,
- Michael

Thanks for your help and answers to my questions! Yes, I just discovered today that v3 isn't beta anymore. I will definitely be upgrading. You have created a great program!

Yes, that Rhino file has all of the edges. I noticed that the surface is missing, though. Even though, I have owned your program for a while, I'm a relative newbie when it comes to MoI, is there a way I can make that surface myself?

-Randy

I was able to fill in the surface with Loft. Thanks again for all of the help!
-Randy

You're welcome Randy! Yup Loft was the right tool for filling that in.

- Michael