If your AutoCAD hangs indefinitely when trying to load a drawing with AEC objects, here are practical, tested fixes to get things working again:

1. Temporarily Disable AEC Object Loading #

First, let’s get the drawing open by skipping AEC object initialization:

• Launch AutoCAD but don’t open the problematic drawing yet.
• Type AECOBJECTSLOAD in the command line and set the value to 0. This tells AutoCAD to skip loading AEC objects on startup.
• Now open your drawing—if it loads successfully, you can re-enable AEC support later by setting AECOBJECTSLOAD back to 1.

2. Fix Corrupted AEC Data #

Corrupted AEC objects or styles are often the root cause. Once the drawing is open (using the trick above), run these commands:

• AECDBG: This built-in tool audits and repairs issues with AEC objects and their associated styles. Follow the on-screen prompts to fix any detected problems.
• PURGE: Run this command multiple times (make sure to check "Purge nested items" and "Purge zero-length geometry") to clear out unused AEC styles, blocks, and orphaned data that might be causing conflicts.

3. Update AutoCAD and AEC Extensions #

Outdated software frequently has known bugs with AEC object handling:

• Go to Help > Check for Updates in AutoCAD to install the latest patches and service packs.
• If you’re using AutoCAD Architecture, Civil 3D, or other AEC-focused tools, ensure those extensions are also fully updated—sometimes fixes are specific to these add-ons.

4. Load the Drawing in Safe Mode #

Third-party plugins can interfere with how AutoCAD processes AEC objects:

• Hold down the Shift key while launching AutoCAD to enter Safe Mode (this disables all plugins by default).
• Try opening the drawing here. If it loads without issue, enable your plugins one by one (via Manage > Apps) to pinpoint which one is causing the hang.

5. Use AutoCAD’s Recovery Tools #

If the drawing itself is corrupted, leverage AutoCAD’s built-in recovery utilities:

• From the AutoCAD start screen, click Open > Recover and select your drawing. The RECOVER command scans for and repairs common corruption issues.
• For a more thorough fix, use RECOVERALL (type it directly into the command line)—this tool also repairs any attached external references that might be contributing to the problem.

6. Rebuild AEC Objects via Export/Import #

If the above steps don’t resolve the issue, try rebuilding the AEC content:

• Open the drawing with AECOBJECTSLOAD set to 0.
• Select all AEC objects (use SELECTALL then filter out non-AEC elements if needed).
• Export them to a DXF file using DXFOUT.
• Purge the original drawing completely, then re-import the DXF with DXFIN. This cleans up any hidden corruption in the object data that standard repair tools might miss.

7. Check System Resources #

AEC objects are resource-heavy—make sure your system can handle them:

• Close unnecessary applications to free up RAM and CPU power.
• Verify your system meets AutoCAD’s minimum hardware requirements (16GB+ RAM is recommended for large AEC drawings, along with a compatible GPU).

If none of these steps resolve the issue, consider reaching out to Autodesk support with a copy of the problematic drawing, as it might contain unique corruption that requires specialized repair.

内容的提问来源于stack exchange，提问作者command2112