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[Repro - Crash] Duplicating Material Nodes Causes Instant Crash

Using the Ctrl+W Shortcut when duplicating a material node occasionally causes a crash, this can also occur after the node has been duplicated and you try to connect it.

I've seen this issue posted multiple times here already but it keeps being closed (not useful!) I get the following callstack error:

 We apologize for the inconvenience.
 Please send this crash report to help improve our software.

I've seen the other answerhub posts asking for DXDIAG and other log files, where can I find those? I suspect this crash is also related to another one I posted (that has been fixed but not yet implemented by a community member) here:


Product Version: Not Selected
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asked Sep 02 '14 at 12:46 PM in Bug Reports

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avatar image Doug E ♦♦ STAFF Sep 02 '14 at 04:43 PM

Hey TheJamsh-

The Logs are found in the project folder -> saved -> Logs. It is best to include the most recent log file after the crash. The DXDIAG can be found by navigating to this folder: C:\Users\USER.NAME\AppData\Local\UnrealEngineLauncher\Saved\Logs

Also, to help with the investigation, which nodes are you using that you have seen cause this crash?

avatar image TheJamsh Sep 03 '14 at 08:21 AM

Thanks Doug, I'll try and get it to happen again today and post the logs.

As for the nodes, it seemed to happen sporadically. I thought initially it might only be nodes that have an existing shortcut, but in fact it seemed to happen with all the following if I remember rightly.

  • Constant Bias Scale

  • Add

  • Subtract

  • Texture Sampler

  • Frac

I'm wondering if perhaps it's caused when you have a node connected, disconnect it and duplicate it? The issue with the dynamic parameter was something to do with the node not refreshing or being 'recreated' IIRC

Here is the network I was building (from left to right) that was causing the crash. Interestingly, I also got a completely different crash when connecting the succesfully Duplicated Texture Sampler to the emissive channel instead of Previewing the node. It seems that there is a certain point where the material is unstable, and after that regardless of what nodes are deleted, it still has the potential to crash the engine.

alt text

save.jpg (93.9 kB)
avatar image TheJamsh Sep 03 '14 at 11:59 AM

So as predicted it happened again, duplicating a 'Component Mask' node certainly seems to cause it regularly.


 We apologize for the inconvenience.
 Please send this crash report to help improve our software.

I've attached ALL of my logs and dump-files for the crashes the UE4 has generated in this project, the most recent ones are the ones highlighting this problem. (See: Logs.Zip)

link text

However, I did NOT get any DXDIAG file in the location you specified, nor any other location that I thought to look in.

logs.zip (506.7 kB)
avatar image fourche13 Sep 23 '14 at 01:51 PM

yes same thing for me since the 4.2 version of the engine. Ctrl +w or copy / paste

avatar image Doug E ♦♦ STAFF Sep 23 '14 at 03:03 PM

Hi fourche13-

It helps to know how long something like this has been affecting users. The developers are aware of this issue and are working on a solution that should come out in a future update to the engine. If you continue to see this issue in current versions of the engine then let us know and I can add any information you can provide to the bug tracker.

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1 answer: sort voted first

Hey TheJamsh-

Thank you for the information. I have passed this issue on to our developers for further investigation into the cause of this crash as TTP #345735.


Doug Wilson

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answered Sep 04 '14 at 08:17 PM

avatar image TheJamsh Oct 02 '14 at 07:21 AM

Hi Doug, do you know if this has been included in 4.5 at all?

avatar image Zombie Dec 03 '14 at 03:59 PM

Yeah I get this at least 10 times a day this crash. It's kind of annoying.

avatar image Doug E ♦♦ STAFF Dec 03 '14 at 04:28 PM

Hey Zombie-

We are still investigating this crash and working on an adequate fix that will be included in a future update to the engine.

avatar image klh360 Mar 28 '15 at 10:37 PM

Does anyone know if this is supposed to be fixed in 4.6.1. I'm still experiencing it. We have done a lot of customization to the engine, so I'm not sure if it's us or stock UE4.

avatar image Doug E ♦♦ STAFF Mar 31 '15 at 06:52 PM

Hey klh360-

Could you post the DXDiag for the machine experiencing the crash? Additionally you may want to try lowering the scaleability settings.

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