Unreal Engine Issues
Unreal Engine Issues
Visual discrepancy between lighting in Cloud Presenter and editor viewport
TM - Rendering - Feb 24, 2026Reported in SF [Link Removed] In this user’s scene, the lighting in the Cloud Presenter does not match the lighting in the editor viewport. The Cloud scene is notably darker than the editor. The s ...
Unstable automation tests in "Standard Tests" list.
UE - Rendering - Architecture - Feb 20, 2026The two following automation tests found in the "Standard Tests" list hit exceptions & cause the editor to crash:System->Physics->Interface->BodyInstanceShaders->ShaderPreprocessor->BuiltInMacros ...
anim notify states are triggered when updating thumbnails
UE - Runtime - Animation - Feb 19, 2026The issue is that FAnimationSequenceThumbnailScene::SetAnimation calls referesh bone transforms which will trigger notify states present at the midpoint of the animation (as the thumbnail code sets ...
OCIO + nDisplay not producing expected output in Disguise
UE - Virtual Production - Rendering - Color - Feb 19, 2026Based on [Link Removed] OCIO + nDisplay not producing expected output The issue is just that when using UE 5.6 or later the resulting colour looks off compared to what 5.5 and pevious versions wou ...
The hierarchy of Actors in LevelInstances can break when using BPs as parent
UE - World Creation - Worldbuilding Tools - Level Instances - Feb 18, 2026The hierarchy of a LevelInstance actors (Outliner) will break when cooking. The source is the call to AActor::RerunConstructionScripts in FWorldPartitionLevelHelper::MoveExternalActorsToLevel. The ...
Empty View Sets created when creating new images or panoramas
TM - Tools - Feb 16, 2026Reported in SF [Link Removed] Starting in TM 2025.2, when creating new images or panoramas, a new View Set is created with each new image or panorama. These View Sets will not have any names and ca ...
Compiler Error when including InstancedSkinnedMeshComponent.h
The UE_EXPERIMENTAL macro is not used correctly in InstancedSkinnedMeshComponent.h. It should come after the 'class' keyword & before UInstancedSkinnedMeshComponent as specified in the documentation ...
"Move to Level" of Landscape Tool leads component scale mismatch
UE - Graphics Tools - Terrain - Landscape - Feb 12, 2026In UE 5.7.2, when moving a Landscape Component to a sub-level using Landscape Mode > Manage > Move to Level, the proxy transform is not synchronized with the root Landscape when the KeepWorldTransfo ...
HISM causing massive spikes in BuildTreeAsync
UE - Rendering - Architecture - Feb 12, 2026Loading a world partition cell containing dense foliage (30k+ instances per cell) causes spikes on lower end hardware of up to 10-15ms and can observe spikes of 2-5ms on high end hardware too primar ...
Division by zero causing NaN/Inf on USkeletalMeshComponent::UpdateRigidBodyScaling() when setting scale to zero and back
UE - Runtime - Simulation - Feb 11, 2026Up to UE 5.5, skeletal mesh physics did not get updated when the component's scale changed. This was improved on January 2025 with CL 39190335, which addressed [Link Removed] ...