One basic error that bugs me every-now-and-then is the "Filedia" setting. This setting controls the display of dialog boxes used with commands that read and write files.
AutoCAD users are used to seeing dialog boxes everytime they open a file. I'm gulity of this, also. A user who is not familiar with the filedia setting will just say that the program has been bugged because it displays a prompt on the command line instead of the usual dialog box.
If this happens, just type "filedia" on the command line (without the quotation marks) then input 1. Voila! Back to our old reliable, user-friendly Dialog Box.
The latest technical support I had with this setting was last week. I had the same query from the same client few months ago. I was quite surprised that she had the same problem, again. She said that the filedia didn't work anymore. By the way, she was using Map 3D 2007. After listening to her describing what was happening to her workspace, I was in doubt that something might be wrong with her procedures. According to her, she was typing "filedia" but there was an AutoCAD error. I found this a bit strange so, I asked her to send me a screenshot of the error.
Here it is:
It turned out that she was typing filedia on the prompt after she has clicked the File>Open instead of typing it in the command line. Whew!!! Oh well, she sure has overlooked some minor details there.