Unreal Engine Issues
Unreal Engine Issues
[CrashReport] UE4Editor-Slate!FSlateApplication::OnMouseUp(EMouseButtons::Type,FVector2D) [SlateApplication.cpp:5321]
UE - Anim - Rigging - Feb 15, 2021Generated from CrashReporter User information:Tried to choose f_med_brw_body_skmesh for the retargeting pose as mentioned at: https://docs.unrealengine.com/en-US/Resources/Showcases/MetaHumans/Reta ...
Performance drop when spawning AI actors during runtime compared to placing them in world
UE - AI - Jan 9, 2019There is a performance difference between spawning and placing AI into a level. This is causing issues when spawning/despawning AI actors in a large open world, where 4-5ms of frame time quickly bui ...
File > Package > Desktop (Win+Mac+Linux) redirects user to the main Docs Splash page
Docs - Apr 18, 2018When attempting to use the "All Desktop" packaging functionality, in the editor, the user is redirected to the main splash page for UE Documentation: https://docs.unrealengine.com/en-us/ I do belie ...
Orphaned BP actors when using UWorldPartitionBuilder
UE - World Creation - Worldbuilding Tools - World Partition - Nov 21, 2025From an EPS case: --------------------------------- We're seeing a recurring issue where child BP actors are becoming orphaned during any processing that uses UWorldPartitionBuilder. It affects ...
Lags in animation when set leader pose component is used
UE - Rendering - Architecture - Aug 2, 2023https://udn.unrealengine.com/s/question/0D54z00009UJv5HCAT/lags-in-animation-when-set-leader-pose-component-is-used From licensee: "USkinnedMeshComponents have the option to double-buffer their bo ...
UMG Widget color and Text color has different output at UE4 editor to Mobile preview and Mobile device.
UE - Editor - UI Systems - Jul 3, 2015UMG Widget color and Text color has different color output at UE4 editor to Mobile preview and Mobile device. https://udn.unrealengine.com/questions/251945/umg-viewport-device%E1%84%8B%E1%85%A6%E1% ...
ARCore plugin missing 'tools' components
UE - Platform - XR - Jul 28, 2018https://forums.unrealengine.com/development-discussion/vr-ar-development/1494917-ue-4-20p4-arcore-image-database-cannot-build/page2 Bo Pang from Google writes: "I think there are two issues here: 1 ...
Texture streaming uses ISM component bounds instead of closest ISM instance
UE - Rendering - Architecture - Jan 22, 2026When regular texture streaming is used (not virtual textures), the largest mips are always loaded for ISM mesh textures whenever the camera is inside the bounds of the ISM even if the instances are ...
RestrictedToClasses UCLASS Meta expects space delimiters but documentation shows comma delimiters
UE - Gameplay - Jul 19, 2019The documentation: https://docs.unrealengine.com/en-US/Programming/UnrealArchitecture/Reference/Metadata/index.html shows the RestrictedToClasses meta syntax as being RestrictedToClasses="Class1, C ...
NiagaraSystem with EniagaraGpuComputeTickStage::PostInitViews rarely crashes due to multi-thread race conflicts
UE - Niagara - Mar 1, 2025NiagaraSystem with EEiagaraGpuComputeTickStage::PostInitViews should not have bSupportsParallelGDME because of possible multi-threaded contention, but FNiagaraSystemInstanceController::GetGpuCompute ...