If you open the file references palette, you will see warning that the files are not found. If your project has several folders, then add them all.
Please forgive me for being lazy, I don’t even give the files appropriate name and just use Auto CAD default file name when saving. For example: if Project has sub-folder arch, struct, and mep, you have to add the subfolders too.
This routine from Benzigar Peter allows you to reload an xref while restoring the original layer properties, and not have to worry about the Visretain settings.
After you load the LISP file, run the command Xrecol and select the xref.
This type of file is called an external reference or Xref.
The Xref file does not become part of a drawing database and it is loaded simultaneously with other drawings in which it is imported.
As a result, Auto CAD is not recognizing your custom fields.
You may start getting layers not showing up, or layers that are the wrong color.
It most likely is set to “1” which means retain the XREF layer settings. But if there are visibility problems – it may have become corrupted.
By the way, when you set it to “0” – you will loose all of your layer ON/Off settings for all xrefs, not just the one that was not working right.
Reference drawing layers can be modified in the parent drawing and changes to color, linetype, and other properties are maintained as long as the system variable Visretain is set to 1.