topic Re: C4DtoA 4.8.5.1 Crashes constantly in Arnold for Cinema 4D Forum

C4DtoA 4.8.5.1 Crashes constantly

Kidmograph — Mon, 12 Jan 2026 18:34:04 GMT

Hi,

I'm experiencing continuous crashes in both Mac (M4) and PC with latest plugin update for C4D.

The scene isn't complex. Just textures, toon shaders/render, and some non-hi poly meshes..

are there any common issues or it's just me? Do you recommend to roll-back?

Thanks in advance.

-G

Re: C4DtoA 4.8.5.1 Crashes constantly

peter_horvath — Tue, 13 Jan 2026 13:32:49 GMT

The latest plugin version is working fine on my workstation. Do you have the same crashes in every scene, or only in a specific one? Do the crashes started to happen after a plugin update? If so, what was the last version that was working?

Can you send me the minidump.dmp file from that _bugreports folder you have in your screenshot (if exists)?

Re: C4DtoA 4.8.5.1 Crashes constantly

Kidmograph — Tue, 13 Jan 2026 16:44:47 GMT

Edit: Minidump added

Hi Peter,

Seems to be this project. Tested older and different scenes and it works ok so far.

The issue happens while running the IPR while changing parameters in the shaders (both the old xpresso and the new node system)

I can't attach the minidump (it says the extension .dmp isn't supported), but attached the bug report.txt.

Happy to send the collect, but since it's just this particular file (I was just starting creating that scene just for fun so I will start from scratch at any other time), no worries.

Thanks

Re: C4DtoA 4.8.5.1 Crashes constantly

Stephen.Blair — Tue, 13 Jan 2026 16:39:25 GMT

You could just rename the dmp file to minidump.txt

Re: C4DtoA 4.8.5.1 Crashes constantly

peter_horvath — Tue, 13 Jan 2026 16:44:19 GMT

You can rename to txt as Stephen suggested or add it to a zip file. Unfortunately, I can't do much with the _BugReport.txt file, because it does not have any debug information we need.

If the issue is specific to your scene and it's not confidential, would it be possible to share that scene? Or a minimal version of the scene with replacement meshes and textures, that still show the problem?

Re: C4DtoA 4.8.5.1 Crashes constantly

peter_horvath — Wed, 14 Jan 2026 10:35:58 GMT

> Edit: Minidump added

Sorry, I still can't see the minidump attached to the report.

Re: C4DtoA 4.8.5.1 Crashes constantly

Kidmograph — Wed, 14 Jan 2026 12:07:14 GMT

Added it as .zip file

Also added the project file with the assets.

Thanks.

Re: C4DtoA 4.8.5.1 Crashes constantly

Kidmograph — Sun, 18 Jan 2026 14:59:34 GMT

Hello Peter,

I have uploaded the project file and the mini dump days back..let me know if you had time to look at it.

Thanks,

-G

Re: C4DtoA 4.8.5.1 Crashes constantly

peter_horvath — Tue, 20 Jan 2026 14:05:44 GMT

Sorry for the late reply. I could get to your issue only today. The good news is that I can reproduce the crash with your scene. I'm not sure yet why it's crashing though, I have to investigate more. Will let you know.

Re: C4DtoA 4.8.5.1 Crashes constantly

Kidmograph — Tue, 20 Jan 2026 20:17:15 GMT

Thanks for getting back to me. Ok, that sounds great!

Re: C4DtoA 4.8.5.1 Crashes constantly

peter_horvath — Thu, 22 Jan 2026 18:25:15 GMT

Can you please try to set 'enable_fast_ipr off' in Render Settings > Diagnostinc > User Options, and see if that fixes the crash?

Re: C4DtoA 4.8.5.1 Crashes constantly

Kidmograph — Fri, 23 Jan 2026 11:42:29 GMT

Did that and it's the same.

Keep crashing on simple things such as changing object subdivision or trying to open a shader..

Re: C4DtoA 4.8.5.1 Crashes constantly

peter_horvath — Tue, 27 Jan 2026 12:12:03 GMT

Good news, we have found what's causing the crash. Sorry, that it took so long. It will be fixed in a next release. In your repro scene, the displacement on the Cube is triggering it, but it's a more generic problem introduced in one of the recent releases.

Re: C4DtoA 4.8.5.1 Crashes constantly

Kidmograph — Fri, 30 Jan 2026 14:42:00 GMT

Hey Peter,

Sorry for the delay. I have been playing with the file and got to the same conclusion. I have deactivated the displacement node and it ran ok. In fact I have finished the little scene:

https://www.threads.com/@kidmograph/post/DUCK7Vuj04f?xmt=AQF0_LO1gT2mKZ2782KoEMH1dDDXKYdizaZDGYKcUhkiHg

Thanks for the quick support, even when we couldn't fix it for now. 👍

Re: C4DtoA 4.8.5.1 Crashes constantly

peter_horvath — Fri, 30 Jan 2026 15:00:47 GMT

Looking awesome. I'm glad you could finish the project.

Re: C4DtoA 4.8.5.1 Crashes constantly

Kidmograph — Fri, 30 Jan 2026 16:32:41 GMT

Thank you man!