C3D 2026 Crash on Drawings When I Open vs Recover

[th22MV7]

Has anyone noticed that on certain Drawings (for me it seems to be ones with paper space entities, text, viewports, etc) if you try to open said drawing normally, it crashes CAD, but if you use Recover, it opens just fine, and typically recovers with 0 errors?

[paullimapa]

Perhaps there are xrefs that need recovering?  Have you tried Recoverall command?

Do you have latest 2026 C3D updates installed?

[th22MV7]

No xrefs or attachments associated with these drawings, so recoverall wouldn't accomplish anything ... and yes, all updates are installed.

[paullimapa]

have you tried opening the drawings using vanilla AutoCAD?

[th22MV7]

I don't think I can.  When I run Acad.exe, it still runs C3D.

[paullimapa]

1) Can you try running in safemode to see if that would make a difference?

https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/How-to-launch-an-A...

2) Does the problem occur in previous versions like 2025?

3) Try creating a new Windows account with admin privileges, login as that new user and see if that makes a difference 

[th22MV7]

Ran in safemode like you suggested and still instant crash.

I don't have access to any previous versions.  

I'll have to try the new Windows account another time.  I don't have time to do that right now unfortunately.  But I suspect it won't matter.

[DesignerGuy1961 · Accepted solution]

I was having the same issue and it was driving me crazy!

Fortunately, I was able to find a solution that worked for me. Give it a try and see if it works for you.

For me, I narrowed it down specifically to drawing layouts that have viewports; the viewport itself was creating the issue.
To correct it:
Go to Options, System Tab, under Hardware Acceleration click the Graphics Performance button, then turn Hardware Acceleration off.

[paullimapa · Accepted solution]

Thanks for sharing. Looks like in your case it’s definitely related to graphics card compatibility. Perhaps before going to the extreme solution of turning hardware acceleration off, try the following 

At command prompt enter:

GFXDX12

0

Thats a zero, close & restart AutoCAD

If still no good, at command prompt enter:

GRAPHICSCONFIG

Select another option under 2D Display Settings

If still no good, try updating your graphics driver

[DesignerGuy1961]

Thanks. I'll have a look at that in the future as time permits.

[th22MV7]

You are a gentleman and a scholar!  Thank you!!!

[th22MV7]

That worked!  Thank you!!!

[paullimapa]

you are welcome...cheers!!!

[DesignerGuy1961]

Hey, Paul. I just turned hardware acceleration back on and changed GFXDX12 to 0. That worked. Yours is clearly the better solution. Thanks a million!

Additionally, this exact same issue appeared in another thread where I posted my solution. Given that your solution is cleary better, I think you should post it there as well. Thread is loacated here:

https://forums.autodesk.com/t5/civil-3d-forum/cannot-open-a-drawing-civil-3d-2026/td-p/13812222
For those who may be interested, I looked up  exactly what GFXDX12 does. Here is the explanation:

GFXDX12 is a system variable in AutoCAD that controls the graphics rendering mode. It allows users to switch between DirectX 12 (DX12) and DirectX 11 (DX11). This setting can impact performance and display quality, especially on different hardware configurations.
How to Change GFXDX12

To change the GFXDX12 setting, follow these steps:

Open AutoCAD.
Type GFXDX12 in the command line and press Enter.
Set the value:
1: Use DirectX 12 (default setting).
0: Switch to DirectX 11.

After changing the value, restart AutoCAD for the changes to take effect.

Thanks again, Paul!

[paullimapa]

Glad that worked out for you…cheers!!!