Hi JimT,
It sounds like perhaps you have resolved this problem yourself, but if you're still having an issue then feel free to get in touch with our support at support@.... I think we'd just need a bit more information to resolve this problem.
If you are an experienced CAD user then I would suggest you bypass our file import window and just copy and paste entities direct from CAD. This is what I do, because it means you can use all of CAD's filtering tools to select the appropriate entity(s), rather than just selecting by layer. Our CAD import window is mostly designed for those who do not use CAD very much, but still want to work with CAD files.
There's a couple of caveats to copying and pasting directly from CAD to Cubed, as opposed to using the CAD entity importer:
1 ) The units have to match between CAD and Cubed. Since our software works in feet or metres, this means your CAD data needs to be in feet or metres and match your Cubed software settings. I.e. if your CAD file is in inches or millimeters (which is unusual) you may need to scale the CAD file before you can copy and paste this way.
2 ) Any entities that you paste which cannot be pasted into cubed will be ignored. E.g. if you paste lines which are not flat when you have the contours tab selected, they will not paste. Likewise, if you paste lines which are not closed into the outlines tab they will be ignored.
Hope this helps,
Leo