Race condition in USkeletalMeshComponent::TickCloth due to delayable tick function.

UE - Simulation - Physics - Character - Aug 1, 2016

USkeletalMeshComponent::TickComponent is run in the PrePhysics tick group. This is the only place where the SkeletalMesh is actually checked to be != nullptr to determine whether or not the TickClot ...

UE 5.5 delayed Python initialization causes issues

UE - Editor - Workflow Systems - Oct 28, 2024

From this UDN: [Link Removed] The customer reports that this issue did not happen in 5.4. ...

Ensures for Pixel and Vertex Shaders occur when running TM-ShaderModels with -onethread

UE - Graphics Features - Jan 20, 2017

Two ensures fire when opening the TM-ShaderModels Map in QAGame with the -onethread argument. The callstacks look identical with the exception that one is for a pixel shader and the other is for a v ...

Delay when attempting to input Korean characters using an IME with certain types of text boxes

UE - Editor - UI Systems - Localization - Nov 8, 2018

A user has reported that inputting Korean into certain types of text boxes in the editor using an IME results in delayed input. The user reports that this occurs with SMultiLineEditableTextBox in th ...

[CrashReport] UnrealEditor-LevelEditor!FViewportClient::InputKey(FInputKeyEventArgs const &) [UnrealClient.h:851]

UE - Editor - Workflow Systems - May 27, 2021

Generated from CrashReporter ...

Build All Levels fails with duplicate level instances

UE - World Creation - Worldbuilding Tools - Level Instances - Jan 24, 2024

Allow having TArray with index size using 64 bits instead of 32 bits

UE - Foundation - Core - Apr 27, 2018

With the geometry data getting bigger and bigger we hit more often the int32 limits of the default TArray. All geometry data is store in array so we cannot have more then 2GB of vertexinstances or t ...

References to recompiled Blueprint CDOs that exist outside of the immediate class hierarchy are not being replaced during compilation.

UE - Gameplay - Blueprint Compiler - Feb 24, 2022

Currently, the Blueprint compiler will only update references to a reinstanced CDO/archetype object if it falls within the immediate hierarchy of the Blueprint class type OR if it's a component temp ...

[CrashReport] UE4Editor_Engine!UAnimMontage::IsValidAdditive() [animmontage.cpp:702]

OLD - Anim - May 19, 2016

Error message: Stack overflow - code c00000fd (first/second chance not available) Source Context: 687 if (SyncGroup != NAME_None) 688 { 689 CollectMarkers(); 690 ...