Unreal Engine Issues
Unreal Engine Issues
[CrashReport] UE4Editor_Engine!FTextureCacheDerivedDataWorker::BuildTexture() [texturederiveddata.cpp:772]
UE - Graphics Features - Feb 20, 2017Error message: Access violation - code c0000005 (first/second chance not available) Source Context:757 if (SourceMips.Num()) 758 { 759 FFormatNamedArguments Args; ...
AbilitySystemComponent::NotifyAbilityEnded Can Crash due to Callbacks Invalidation Specs
UE - Gameplay - Gameplay Ability System - Oct 11, 2023Pasting from the UDN: Unsafe code in AbilitySystem can lead to crash when granting an ability inside OnAbilityEnded Hello. We just ran into a crash. After investigation, it seems to be caused by ...
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 ...
[CrashReport] UE4Editor-ApplicationCore.dylib!FMacWindow::ApplySizeAndModeChanges()
UE - Platform - Apple - Oct 27, 2017This is an early trending Mac crash in 4.18. Users have not provided any descriptions of their actions when the crash occurred. Callstack from LogLogAssetRegistry: Asset discovery search completed ...
Skeletal Mesh Has Flickering Artifacts On Mac
UE - Graphics Features - Oct 26, 2016White artifacts appear when you have a stationary directional light in your scene with default settings that is casting a shadow, and a skeletal mesh is in that shadow after baking lighting. You wi ...
Drag and drop operations on web pages in the web browser widget do not appear to work
UE - Editor - UI Systems - Jul 6, 2017When using a web browser widget to pull up a web page that has a drag and drop functionality, the drag and drop functionality does not work when done through the web browser widget. ...
Striped Stencil Artefacts across scene under OS X using ATi 4xx0 GPUs
UE - Platform - Apple - Nov 21, 2014From AnswerHub: Lighting problem [Mac] I am currently testing UE4 on a Mac at my college, but there are these strange lines where light is being cast onto surfaces. I'm currently wondering if this i ...
Dynamic Directional Shadows do not work with Planar Reflections
UE - Graphics Features - Aug 9, 2016Movable/Stationary dynamic shadow distance in the Directional light is not captured in the Planar Reflection. Note that Point and Spot Lights box cast shadows that can be rendered in the reflection ...
EnhancedInput Chorded Actions do not work on higher priority mappings
UE - Gameplay - Input - Aug 21, 2023Reported from Prismatic: It appears that the Add Mapping Context function currently prioritizes low numbers over high numbers, which seems inconsistent with the function description and some parts ...
UHT will fail to build a project that contains a BlueprintPure UFUNCTION that returns an ENetMode value.
UE - Foundation - Core - Aug 5, 2015Marking a function as BlueprintPure will result in a UHT build failure in Visual Studio if the function returns an ENetMode value. The ENetMode enum is not marked as a UENUM(), causing the build to ...