Nick,
Have you read the tutorial: Using Rhino surfaces
This tutorial covers:
> Inserting provided Rhino files
> Sketching on the appropriate planes/faces
> Using the Trim Model function
....
> 1. In a new part workspace, from the Insert menu select Surfaces...
As far as I know, there is no *.3dm direct import option.
( I use Alibre Expert 64 bit)
Looks like you have installed a third-party plug-in, which caused the problem.
( Maybe it was a similar problem to -> http://forum.alibre.com/viewtopic.php?f=1&t=12687)
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