Unreal Engine Issues
Unreal Engine Issues
[CrashReport] UE4Editor_CoreUObject!UObjectBase::IsValidLowLevelFast() [uobjectbase.cpp:294]
UE - Foundation - Core - Aug 22, 2017This is a common crash in the 4.16 and 4.17 releases. User DescriptionsWriting a custom component in C++. Hotcompiled it through VS2017. Had the BP editor open with a class derived from that compo ...
[CrashReport] Undo crash - FD3D11DynamicRHI::RHIDrawIndexedPrimitive() [d3d11commands.cpp:1650]
UE - Graphics Features - Nov 2, 2017This is a trending crash coming out of 4.18, although it also occurred with less frequency in 4.16 and 4.17. The callstack shares similarities to [Link Removed] and [Link Removed], and the user com ...
Unable to override private Blueprint variables in child classes
UE - Gameplay - Blueprint - Jun 16, 2022In UE4, "Private" for Blueprint variables was misnamed: its behavior actually meant "Protected". In other words, it can't be read or written to by external objects, but it can be by derived types. A ...
USkeletalMeshComponent::HandleExistingParallelClothSimulation() calling WaitUntilTaskCompletes can trigger arbitrary task that modifies currently iterated UWorld::ComponentsThatNeedPreEndOfFrameSync
UE - Rendering - Architecture - Feb 23, 2024Context ActorComponents can schedule an end-of-frame update for themselves by calling UWorld::MarkActorComponentForNeededEndOfFrameUpdate. The UWorld will iterate all those actor components once pe ...
Physics Asset primitives are being created with the default Name as None instead of BoneName_PrimitiveType
UE - Editor - Content Pipeline - FBX - Oct 27, 2024When creating Physics Assets, either by automatic creation upon import, creation from skeletal meshes already in the project, or when we press Generate All Bodies (bottom right of a opened Physics A ...
AutoSize triggers ensure on shortened Skel Anim Section moved past anim length
UE - Anim - Sequencer - May 26, 2026In Sequencer, calling "Edit > Auto Size" on a UMovieSceneSkeletalAnimationSection triggers the LowerBound > UpperBound ensure in UMovieSceneSection::SetRange (MovieSceneSection.h:333) when the secti ...
Crash when using "Convert to Variable Curve"
OLD - Anim - Jun 7, 2016Error message: Access violation - code c0000005 (first/second chance not available) Source Context: 7 8 DECLARE_CYCLE_STAT(TEXT("AnimSeq EvalCurveData"), STAT_AnimSeq_EvalCurv ...
[CrashReport] UE4Editor_ClothingSystemRuntime!FClothingSimulationNv::GetBounds() [clothingsimulationnv.cpp:730]
UE - Simulation - Physics - Character - Jul 17, 2017This is a common crash occurring for users in 4.16 and the 4.17 Preview. Additional information is not currently available. User Descriptionsjust shut down dont know why Source Context 807 ...
Orientation Warping breaks incoming poses where bones are in component space
UE - Anim - Gameplay - Apr 17, 2025The orientation warping node breaks incoming poses where bones are already in component space. This is because, in EvaluateSkeletalControl_AnyThread, we are repeatedly setting bone transforms direc ...
Changing bIsSpatiallyLoaded can cause an Actor to be duplicated during Play-In-Editor
UE - World Creation - Worldbuilding Tools - World Partition - Dec 18, 2025Changing bIsSpatiallyLoaded can cause an Actor to be duplicated during Play-In-Editor. As described in the steps to reproduce, if we keep swapping bIsSpatiallyLoaded state and save a Streaming Level ...