Hi Paul, could you maybe be a bit more specific? Like which other programs are seeing surfaces and not only curves?

Also can you send me an example file that I can look at? You can either post it here, or if you want to keep the file private, you can e-mail it to me at moi@moi3d.com .

An example file would definitely help me understand what's going on, otherwise it is hard to guess.

Maybe the surfaces have been marked as hidden objects in the IGES file, and you need to unhide them to see them in MoI.

Or with 3DM files, it's possible for some programs to store other kinds of things in the 3DM file that MoI does not read, like polygon mesh objects for example instead of NURBS objects, or block instances instead of regular objects...

- Michael