How can you update and re-path AutoCAD drawing reference files such as other drawing files, fonts, or plot configuration files after a path has changed?
Reference Manager is the answer
You can locate the Reference Manager from the Windows Start Menu > Programs > Autodesk > AutoCAD 20xx > Reference Manager
(C:\Program Files\Autodesk\AutoCAD 2012 - English\AdRefMan.exe)
The tool is easy to add drawings and see where reference files were found or not.
You can search, select all, invert selections, edit selected paths and even use find and replace paths in batch. There is no need to launch AutoCAD as this tool runs stand alone.
You can load a great deal of drawings into the Reference Manager to make sure you have all the reference files required.
I can isolate the problem reference files and in this case it is a plot style. I can click on it and enter a new path or even browse for the new path.