Unreal Engine Issues
Unreal Engine Issues
Custom Primitive Data on BP instance not taking affect while in editor
UE - Rendering - Architecture - Apr 5, 2023Original Repo is from 4.27, however, it still happens in 5.2. This is happening because the Instance Data system does not update the field UPrimitiveComponent::CustomPrimitiveDataInternal from the d ...
Nanite meshes are lit differently in Actor Colorization view modes than non-Nanite meshes
UE - Rendering - Features - Nanite - Aug 28, 2024When the Lit > Actor Coloration > Affects Navmesh or other Actor Coloration mode is used, Nanite meshes apply lighting differently than non-Nanite meshes which can make it difficult to use the Actor ...
[Enhanced Input] Edge case where bShouldBeIgnored incorrectly being reset after FlushPressedKeys is called
UE - Gameplay - Input - Apr 2, 2026[Link Removed] From UDN, the steps for their repro case: Normal case: Frame N : AddMappingContext → bShouldBeIgnored=true → FlushPressedKeys → bDown=false Frame N+1: OS IE_Repeat arrives → ...
BuildPatchTool crashes on Mac and Linux when building android or ios with multiple chunks
Portal - Feb 18, 2020"It seems that deallocation of TLazySingleton<FInternationalization> causes unhandled exception. If DISABLE_LAZY_SINGLETON_DESTRUCTION=1 is provided - the build completes successfully" ...
Capsule Shadows Not Visible When Using Movable Skylight With Bright Lower Hemisphere Color and Indirect Lighting Cache
UE - Graphics Features - May 9, 2018I have managed to reproduce this issue in 4.18.3 and 4.19.2. In order to make the Capsule Shadow disappear:Indirect Lighting Cache must be used (Volumetric Lightmap works)Skylight must be set to 'M ...
Packaging to HTML5 fails when Online Framework is enabled
UE - Online - Nov 17, 2018Packaging a project to HTML5 while Online Framework is enabled seems to cause packaging failures. It produces the following errors from the Output Log: PackagingResults: Error: unresolved symbol: ...
GetPackageLengthForCooking can be much larger than the actual file path length
Tools - Jul 10, 2019If the file path with the asset contains a project name, the cooking file pathlength is incorrectly increased. The following code in ContentBrowserUtils :: GetPackageLengthForCooking causes this is ...
Access Violation - UMovieSceneFolder::PostLoad - Accessing freed memory
zComponent - Archive - Sep 19, 2024A licensee has hit an access violation issue due to a movie scene containing a reference to an invalid child object binding. It triggers in the following method: UMovieSceneFolder::PostLoad // Vali ...
[CrashReport] UE4Editor_Persona!<lambda_e529d88d0657fbede17be1535bc6d479>::operator() [blendspacedetails.cpp:29]
OLD - Anim - Aug 14, 2017This is a trending crash coming out of the 4.17 release. Users have not provided any descriptions of their actions when the crash occurred. The callstack is very close to https://jira.it.epicgames ...
[CrashReport] Assertion failed: !PinRef->bWasTrashed - UEdGraphPin::SerializePin()
UE - Gameplay - Blueprint - Sep 8, 2017This is a common and longstanding crash that has affected more than 200 users since at least 4.15. This crashGroup was previously associated with [Link Removed], but that specific repro case has be ...