Unreal Engine Issues
Unreal Engine Issues
Attempting to apply instance changes to blueprint after altering a struct array crashes editor
UE - Gameplay - Blueprint - Dec 14, 2015Editor crashes if a struct array that has been made editable is edited in an instance within the details pane of the level viewport, then the changes are applied from the instance to the base bluepr ...
When used with First Loop Start Frame Offset and Use Animation Blueprint, the character will alternate between the specified animation and the reference pose
UE - Anim - Anim in Engine - Jan 30, 2023If you use StartFrameOffset set to 1 or higher in conjunction with the Use Animation Blueprint, the character's animation will be rough towards the end of the section. Specifically, it seems that th ...
[Sound Submix] - Dry Level of a Submix is calculated differently whether or not there is an effect in the chain
UE - Audio - Submixes - Jan 21, 2021There is a discrepancy is how the output volume of a submix is calculated when the effect chain is and is not populated. When there is no effect on the submix, the Dry Level adds additional gain to ...
IOS GPU Hang Error (IOAF code 3) and Crash when rotating to Landscape
UE - Platform - Mobile - Oct 11, 2018When users rotate to landscape in QAARApp the apple device will encounter a GPU Hang error and crash.Execution of the command buffer was aborted due to an error during execution. Caused GPU Hang Err ...
GeometryCollectionActor SetSimulatePhysics false does not stop Physics Simulation
UE - Runtime - Deformable - Nov 28, 2024If the GeometryCollectionActor (GCA) is simulating physics, calling SetSimulatePhysics(false) does not stop the simulation. If the simulation is paused, calling SetSimulatePhysics(true) does as expe ...
Skeletal mesh LODs never stream up under SSAM: FSkeletalMeshSceneProxy caches ForceStreamedLOD and is never re-gathered
UE - World Creation - Worldbuilding Tools - Jul 29, 2026UE 5.8, cooked build, SSAM enabled (s.StreamableAssets.UseSimpleStreamableAssetManager=1, required by FastGeo). Symptom: characters spawn at a crude LOD and can never stream up for the lifetime of ...
GAS: Async loaded GameplayCueNotify can execute cue events out of order
UE - Gameplay - Gameplay Ability System - Mar 22, 2025Licensee reported problem via UDN. Context GameplayCues ('cue') are events that can be fired by game code, that are identified via a GameplayTag. Cues can be instantaneous or can be a state on any ...
Resetting the Location of an Actor Not Created at 0,0,0 Does Not Reset it to Default
UE - Gameplay - Blueprint - Sep 7, 2016When attempting to reset the location of an actor blueprint instance that was not created off of an empty actor placed at 0,0,0, the location gets set back to the original location of the empty acto ...
StableSpringsSystem has lots of warnings
UE - Runtime - Deformable - Apr 6, 2026System successfully compiled with 16 warnings. /Engine/Generated/NiagaraEmitterInstance.ush:2732:250: note: variable 'OutMaterialMultiplier' is declared here void SolveDistanceSpringMaterial_Emitter ...
Crash when a StateTree-related Parameter is of a type that includes two nested arrays with the same name (due to FPropertyChangedEvent::ArrayIndicesPerObject using array names to map to their changed indices)
UE - Framework - Dec 19, 2025This issue was reported in the context of adding and setting parameters on StateTrees, Tasks and related assets, but its root cause lies in the structure FPropertyChangedEvent and can possibly affec ...