# Unreal Crashes 5.81

**URL:** <https://forums.unrealengine.com/t/unreal-crashes-5-81/2746230>\
**Category:** Issues and Bug Reporting (Unreal Engine)\
**Tags:** unreal-engine, open\
**Created:** [August 24, 2026, 11:30pm UTC](https://forums.unrealengine.com/t/unreal-crashes-5-81/2746230 "2026-08-24T23:30:07Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![DigitalSketch](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/digitalsketch/32/915323_2.png) [@DigitalSketch](https://forums.unrealengine.com/u/DigitalSketch)\
**Post date:** [August 24, 2026, 11:30pm UTC](https://forums.unrealengine.com/t/unreal-crashes-5-81/2746230/1 "2026-08-24T23:30:07Z")

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### Summary

I created a new material and tried setting the Blend Mode to TranslucentGreyTransmittance, but UE crashes every time. I looked online for a solution and only found a post to verify the files for UE 5.81, which I did, but it’s still happening. Is anyone else having this problem?

### What Type of Bug are you experiencing?

AI

### Steps to Reproduce

Create a new material, set the Blend Mode to TranslucentGreyTransmittance

### Expected Result

UE to not crash

### Observed Result

UE crashes every time

### Affects Versions

5.8

### Platform(s)

Windows

### For crash reports, include your callstack

Assertion failed: Nanite::IsSupportedBlendMode(ShadingMaterial) [File:D:\build++UE5\Sync\Engine\Source\Runtime\Renderer\Private\Lumen\LumenSceneCardCapture.cpp] [Line: 312]

UnrealEditor\_Core  
UnrealEditor\_Renderer  
UnrealEditor\_Renderer  
UnrealEditor\_Renderer  
UnrealEditor\_Renderer  
UnrealEditor\_Renderer  
UnrealEditor\_Renderer  
UnrealEditor\_Renderer  
UnrealEditor\_Renderer  
UnrealEditor\_Engine  
UnrealEditor\_Renderer  
UnrealEditor\_RenderCore  
UnrealEditor\_RenderCore  
UnrealEditor\_RenderCore  
UnrealEditor\_RenderCore  
UnrealEditor\_Core  
UnrealEditor\_Core  
UnrealEditor\_Core  
UnrealEditor\_RenderCore  
UnrealEditor\_RenderCore  
UnrealEditor\_Core  
UnrealEditor\_Core  
kernel32  
ntdll

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<div class="post-metadata">

**Author:** ![TheMightyPunion](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@TheMightyPunion](https://forums.unrealengine.com/u/TheMightyPunion)\
**Post date:** [August 26, 2026, 3:02pm UTC](https://forums.unrealengine.com/t/unreal-crashes-5-81/2746230/2 "2026-08-26T15:02:17Z")

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Same issue and error message, it also crashes when changing the material domain to deferred decal, light function and user interface.  
plugging in a substrate slab of each domain type doesn’t cause the crash and will swap it even when unplugged

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<div class="post-metadata">

**Author:** ![Flak](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/flak/32/769441_2.png) [@Flak](https://forums.unrealengine.com/u/Flak)\
**Post date:** [August 27, 2026, 10:31am UTC](https://forums.unrealengine.com/t/unreal-crashes-5-81/2746230/3 "2026-08-27T10:31:53Z")

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I’ll see if I can get someone to take a look. Thanks for reporting.

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<div class="post-metadata">

**Author:** ![Bug-Reporter](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bug-reporter/32/997076_2.png) [@Bug-Reporter](https://forums.unrealengine.com/u/Bug-Reporter)\
**Post date:** [September 14, 2026, 2:01pm UTC](https://forums.unrealengine.com/t/unreal-crashes-5-81/2746230/5 "2026-09-14T14:01:33Z")

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UE-396638 has been ‘Closed’ as a duplicate of an existing known issue. Origin Issue: UE-393900

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<div class="post-metadata">

**Author:** ![Bug-Reporter](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/bug-reporter/32/997076_2.png) [@Bug-Reporter](https://forums.unrealengine.com/u/Bug-Reporter)\
**Post date:** [September 14, 2026, 2:01pm UTC](https://forums.unrealengine.com/t/unreal-crashes-5-81/2746230/6 "2026-09-14T14:01:33Z")

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UE-393900 is ‘Closed’ as ‘Fixed’. The issue will be addressed in 5.8.3.