DXF importing as flat

I have a large number of DXF files which I want to Grid but despite trying to do this on 3 computers running GM15 and GM17 we have been unable to get elevation data from the files.  Our client has showed this working on his computer, and we can see the 3D data in the DXF files using a 3D viewer.  What advice do you have on importing and griding DXF files
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