An issue cropped up last week with AutoCAD Architecture and AutodCAD MEP that caused a crash of the software with the error "Exception in mc3.dll / mc3d.dll ARX Command". The application crashes when opening a file, or randomly during use. This was caused by a damaged file, whitelist.xml.
If you are getting this error, you can remedy the issue by following the instructions below.
Solution:
To fix the crash:- Exit all Autodesk programs.
- For AutoCAD Architecture 2016:
- Navigate to this folder: C:\Users\<user>\AppData\Roaming\Autodesk\ARCHDESK\2016\{5783F2D7-F004-0409-2102- 0060B0CE6BBA}\7.8.44.0\MC3
- Delete the file WHITELIST.XML.
- Reboot the machine.
- Launch AutoCAD Architecture 2016.
- Enable Desktop Analytics, if you previously disabled it.
- The program will download a corrected WHITELIST.XML file.
- For AutoCAD MEP 2016:
- Navigate to this folder: C:\Users\<user>\AppData\Roaming\Autodesk\BLDSYS\2016\{5783F2D7-F006-0409-2102-0060B0CE6BBA}\7.8.106.0\MC3
- Delete the file WHITELIST.XML.
- Reboot the machine.
- Launch AutoCAD MEP 2016.
- Enable Desktop Analytics, if you previously disabled it.
- The program will download a corrected WHITELIST.XML file.
If the above does not resolve the issue, as a workaround, you may bypass the functionality that causes the crash by doing the following:
- Go to Help > Desktop Analytics (or type DESKTOPANALYTICS on the command line).
- Deselect the "Yes, I would like to contribute to this program." option.
- Click OK.
- Go to Help > Customer Involvement Program (or type CUSTOMERINVOLVEMENTPROGRAM on the command line).
- Select "No, I do not want to join the program at this time."
- Click OK.
- Restart the program.
- Close all instances of AutoCAD.
- Press WINDOWS-R on the keyboard to bring up the Run window, enter REGEDIT and click OK.
- Navigate to and select the following registry folder:
HKEY_CURRENT_USER/software/Autodesk/MC3 - On the right pane of the window, double-click ADAOptIn.
- Change the value to 0 (zero).
- Click OK and close the Registry Editor.
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