I am running AutoCAD 2013, AutoCAD MEP and Revit MEP 2013
I have searched the board and have tried
1. Repairing install or My AutoCAD and AutoCAD MEP 2013 with Antivirus truned off
2. Renaming AcSign.arx to AcSign.old.
I am running Service Pack 1 for AutoCAD 2013 and product is up to date.
Please refer to this post to see if it helps in resolving this issue:
If not, please send the Install and setup logs located in the TEMP directory. You can access this location by typing '%temp%' in the START > RUN.
Thank you and please let me know if this information helps.