Crash when setting Project to only use Windows and DX11 with texture compression as BC7

UE - Graphics Features - Jan 11, 2016

When user sets their texture compression to BC7 while the project settings are set for Platform to only be Windows and use only DX11 this will cause any textures with this set to cause a crash when ...

Adding a UMG widget to the viewport twice results in a crash.

UE - Editor - UI Systems - Sep 8, 2015

Attempting to add the same widget to the viewport twice will result in an assertion and crash. ...

Memory Leak occurring when switching between levels in Standalone

UE - Foundation - Core - Oct 29, 2015

A memory leak seems to occur when switching between levels multiple times. This is being monitored by memreport full ...

r.Shadow.RadiusThreshold and r.Shadow.FadeResolution not affected by Scalability Settings

UE - Graphics Features - Apr 20, 2018

r.Shadow.FadeResolution and r.Shadow.RadiusThreshold values in DefaultScalability.ini are not being applied ...

tvOS crash on startup with Shared Material Shader Code enabled

UE - Platform - Mobile - Jul 9, 2019

Enabling Shared Material Shader Code will cause a crash on tvOS From user: "We originally enabled Share Material Shader Code long before trying a tvOS build, making this crash tricky to debug. W ...

Child actor passes a string to it's parent's overloaded constructor the incorrect string is received

UE - Gameplay - Sep 24, 2019

When a child actor passes a string to it's parent's overloaded constructor using an overridden function that returns a string it won't receive the correct string. I have verified that the correct fu ...

[MetaSounds][Stereo Mixer] - When changing the gain on the Right channel dynamically, the output has clicks and pops

UE - Audio - MetaSounds - Mar 31, 2022

When changing the right channel gain of the stereo mixer at runtime, it generates clicks and pops in the output. ...

Masked TwoSided material causing lumen direct lighting to leak through walls

UE - Graphics Features - Lumen - Apr 23, 2024

It appears that LumenScene's Hardware Ray Tracing is causing light leaking into a sealed room (which should be perfectly black). This bug does not appear to happen on AMD GPUs. ...

Custom node not working with material attributes

UE - Rendering Architecture - Materials - Jul 15, 2024

Using Material Attributes as an input to a Custom Expression causes the HLSL Translator to create multiple CustomExpression# functions, for each used member of the Material Attributes, rather than u ...

High Virtual Texture Sample/Lookup Cost when using a Virtual Texture in a Material Layer Blend

UE - Rendering Architecture - Materials - Mar 14, 2025

Some Material Attribute blends in Material Layer Blends can cause Virtual Texture samples to be duplicated in HLSL. This can be avoided by sampling the Virtual Texture in the Parent Material, and pa ...