Import then cancel while file is read leads to potential crash

TM - Interoperability - Oct 6, 2025

1/ Import a file with mootools such as an fbx 2/ while the file is still read, cancel the import Result : may crash few times after (when theoretically the file has finished being read) - not repr ...

Setting a value Material Parameter Collection to Material will cause crash

UE - Graphics Features - May 2, 2016

Adding a Material Parameter collection to a material, setting its value, then saving the material will cause a crash. This was only able to be reproduced on Mac and did not affect the Windows versio ...

Pasted material function nodes lose their connections

UE - Rendering Architecture - Materials - Dec 3, 2019

The fix for [Link Removed] caused a regression where links to material nodes no longer carry over when a group of nodes is copied and pasted ~ User submitted Image and repro steps appended. I conf ...

Delta struct serialized fast arrays replicating new elements with no changelist

UE - Networking - Jun 14, 2021

There is a scenario where delta struct serialized fast arrays can replicate changes that introduce additional elements to the array, but without changelists containing the new data. This needs furt ...

Shader compiler errors when using enclosed local variables in a material while ray tracing is enabled

UE - Rendering Architecture - RHI - Jan 23, 2020

A licensee is seeing an issue with a couple of post process materials after enabling ray tracing. While the materials presenting the issue fail to compile for different reasons, they both refernce t ...

Depth of field issues on Translucent Materials with Raytracing and DirectX12 enabled

UE - Graphics Features - Lumen - Oct 9, 2020

With DirectX12 and Raytracing enabled, translucent materials are not showing the correct depth of field.  Reported in version 4.25.3(CL 13942748). Tested and found in versions 4.25.3 and 4.24.3(C ...

Some materials render black on Iphone 6 series phones

UE - Platform - Mobile - Oct 6, 2016

Some materials are not rendering on iphone 6 series devices. They will render completely black on one device but not others in the same series. Replacing the material with a basic material renders o ...

Copying a destructible mesh in the viewport loses reference to assigned mesh in the details panel

UE - Simulation - Physics - Destruction - Nov 4, 2014

BRANCH: MAIN CHANGELIST: 2346079 PLATFORM: Windows DESCRIPTION: When copying a Destructible mesh in the viewport the Destructible Mesh component will not be shown for the copied mesh. The mesh can ...

LiDAR not importing colors correctly for .E57 Point Clouds

UE - Editor - Content Pipeline - Jan 6, 2023

Reproduced 3/3 times, issue does not occur in //UE5/Release-5.0 - CL 20979098 Binary. Confirmed Regression. LiDAR plugin is version .08 in UE5.0.3, and version 1.0 in UE5.1.0 ...

Spawn Actors At Location within Dataprep Asset does not specify asset when selecting one from the drop down

UE - Editor - Content Pipeline - Visual Dataprep - Oct 10, 2023

3/3 Set Regression to no as this issue is still occurring within //UE5/Main-Release-5.3 @ CL 28051148 Halo testing was performed on other cards within the Dataprep library to see if this issue was ...