Hello there,
If I read correctly you are using ferrari sketch on Sketchup 2017 due to compatibility issues.

Just wanted to point out, there's a modified version of V1.1 that works up to Sketchup 2021.

We also used an older version of Sketchup just to work on that extension and then move back to a newer version to complete our work, but we were having some issues and asked for help on the Sketchup forum and as a result Mcgordon provided a link he found of a rewritten extension that works in recent versions .

Here is the source link:
https://forums.sketchup.com/t/geometry-wont-paste-from-sketchup-8-into-sketchup-2020-pro/124860/8

Ps. The attached file is the same from the link, just converted to "rbz", for easier install.

FerrariSketch1.1v2015.rbz

@einstein said:

I actually DID delete contents, not just hide layers. Though, it stayed hidden somewhere in the file! I'll do some googling about cleaning up CAD files.

I checked your "forum.dxf" and after cleaning it, it imported fine. Sample attached

Not sure if you have tried this already, but there are some dimensions "31046465 mm" away from your main drawing. We usually have general issues while importing geometry when the area to import is huge or when using Autocad "rays", after deleting these dimensions the text imported fine.

To find this kind of lost geometry you can just double click the scroll wheel on your mouse and it will zoom to extends. - As an option I believe the command is "zoom" + enter + "e" + enter again. For Autocad.

@tig said:

Please report back with any useful discoveries...

Great extension TIG, thanks!

Edited to make it clearer.

Clean file