Acismobj20dbx Best: Autocad Fatal Error

The Ultimate Guide to Fixing "AutoCAD Fatal Error: acismobj20dbx" – Best Solutions

Published by: CAD Troubleshooting Desk
Target Keyword: autocad fatal error acismobj20dbx best
Difficulty Level: Intermediate to Advanced

• Recover command: Type RECOVER → select the problem drawing. AutoCAD will scan and fix database errors.
• Audit & Purge: After recovery, type AUDIT → Yes to fix errors. Then PURGE → Purge all.
• Export to ACIS-safe format: Use EXPORT to save as an AutoCAD 2013 .dwg or even .dxf, then re-import.
• Insert as Block: Start a new blank drawing. Use INSERT (check “Explode”) to bring the corrupt file in as a block. Explode it and then run AUDIT.

Step 3 – Update or Disable Problematic Object Enablers

• Run ENABLERDIAGNOSTIC command in AutoCAD.
• Look for ACIS-related enablers. Uninstall or update any Inventor Fusion, Simulation Mechanical, or old Civil 3D object enablers.
• Temporarily disable third-party ARX applications using ARX command → Unload all non-Autodesk modules.

The Ultimate Guide to Fixing "AutoCAD Fatal Error: acismobj20dbx" – Best Solutions

Published by: TechCAD Solutions
Reading time: 8 minutes
Difficulty: Intermediate autocad fatal error acismobj20dbx best

6. Best Method #3: Repairing Corrupt Drawing Data (AUDIT & RECOVER)

Sometimes, the error is not AutoCAD's fault—it's the drawing file. One 3D solid in your drawing has a "poisoned" ACIS history. The Ultimate Guide to Fixing "AutoCAD Fatal Error:

Last updated: 2025

Final Thoughts

The acismobj20.dbx fatal error is almost always related to damaged 3D geometry or a corrupt installation component. In most cases, Steps 2-4 (recovering the specific drawing with RECOVER and purging) will solve the problem without reinstalling software. However, if you encounter the crash even in a new, empty file, focus on your graphics driver and AutoCAD repair as the primary fixes. Recover command: Type RECOVER → select the problem

Run as Administrator: Right-click your AutoCAD shortcut and select Run as Administrator to bypass potential permission restrictions.

Step 2 – Reset AutoCAD to Factory Settings (No reinstall needed)

• Use Reset Settings to Default from Windows Start Menu > Autodesk folder.
• Or manually: Rename the %APPDATA%\Autodesk\AutoCAD 20xx\Rxx.x\enu folder. AutoCAD will recreate it.