Enum to string conversion has different results in PIE vs Cooked builds

UE - Gameplay - Blueprint Runtime - Aug 17, 2021

This is because the metadata is editor only and will be stripped in a cooked build. We should make the behavior of the to string function consistent between PIE and a cooked build. ...

Long delay on iOS Device Output Log can cost loss of logging on some devices

UE - Platform - Mobile - Feb 8, 2019

If the delay to begin printing the log to the window is too long, some of the logging can be thrown out. This issue does not occur with Android Device Output log UPDATE1: The last time I reproduce ...

MakeMaterialAttributes and LandscapeLayerBlend produce unexcepted results for WorldPositionOffset

UE - Rendering Architecture - Materials - Nov 8, 2021

For comparison, this issue doesn't seem to occur when recreating the setup with Set Material Attributes/GetMaterialAttributes. It seems isolated to the Make/Break nodes. ...

Physics Assets do not show Z (Blue) axis swing graphic.

UE - Simulation - Physics - Sep 13, 2016

4.13 Physics Asset graphics shown for swing settings in Physics Assets doesn't show for Z (blue) axis. Regression from 3039270 (4.12.5 Release), found in 3106830 (4.13 Release). ...

Cannot change inherited variable default values through details panel

UE - Gameplay - Blueprint - Aug 19, 2015

Child blueprints cannot change the default values of inherited variables. ...

Merging negative-scaled actors breaks materials

UE - World Creation - Worldbuilding Tools - HLOD - Mar 27, 2018

Materials are broken when merging a mesh with another that has negative scale Licencee states that bisMirrored in FMeshMergeHelpers::TransformRawMeshVertexData seems to be involved. Does not occur ...

Unable to apply Materials to the chunks of a Destructible Mesh

UE - Simulation - Physics - Jul 31, 2018

When applying a second material to a Destructible Mesh it does not texture the chunks of the fractured mesh. The chunks remain the same as base color of the Destructible Mesh. This is issue was re ...

Engine no longer compiles after backporting RHI thread improvements and crash fix

UE - Rendering Architecture - RHI - Apr 24, 2025

Unreal Engine 5.4 code will no longer compile after applying both the RHI improvement code changes as described in [Link Removed] and the fix for the crash described in [Link Removed]. The compilati ...

C++ Projects Crash in Mac OS 10.11 El Capitan when No Audio Device is Present

UE - Platform - Apple - Dec 22, 2015

This issue has been reported by two different users with very similar circumstances: Both report the editor freezing when trying to compile UE4.10 C++ Projects running Mac OSX 10.11.1 if no audio i ...

Switching a code project created in a source-built Engine to use the binary Engine results in files being deleted from the binary Engine installation

Tools - Nov 18, 2016

If a code project is created in an Engine built from source code, and then it is switched to use a binary Engine installed by the Launcher, building the project in Visual Studio will result in numer ...