Posted by dellus on Mar 10, 2019; 12:37pm
URL: https://forum.librecad.org/DXF-File-Import-Issues-tp5717034p5717057.html

I don't know how to find out what the invalid objects are.
I faintly remember having seen that with the lines to the origin sometimes before, but can't remember the abouts. You could look on which layer the are, maybe this helps to find out the reason. LibreCAD doesn't have the advanced layout features with grouping several drawings on one sheet and so on, this might produce queer results.
If the issue is not solved now for you, you could send me the original file, if you have no concerns, by email. It would be interesting to tinker around with it to get it working for LC, might learn something. Could try with Draftsight, more advanced than LC, Viewports and real paperspace. Free version, but not open source, no Mac version.