Unreal Engine Issues
Unreal Engine Issues
[AI] UE_MT_SCOPED_READ_ACCESS(NavElementAccessDetector) Fails in editor on fresh sync
UE - AI - Navigation - Jan 27, 2025Licensees have reported failed multi-thread access code for NavElementAccessDetector in complex levels that have not finished compilation of their static meshes. The eventual failed check is inside ...
Cannot continuously change Bone Name in SkeletalMesh Sampling Settings
UE - Anim - Jun 14, 2024An access violation occurs in FNiagaraSkeletalMeshRegionBoneFilterDetails::HandleBoneNameComboBoxSelectionChanged() due to StringItem is nullptr. SkeletalMeshRegionCustomization.cpp void FNiagaraS ...
Fail to launch ('Attempt to build nav collision') on device when HLOD is generated
UE - AI - Feb 16, 2017After generating HLOD, game launched from launch on device does not run correctly. 4.14 does not seem to have this issue, so this might be a regression. ...
Subobject delimiter replacement in ResolveName can cause previously valid strings to exceed NAME_SIZE
UE - CoreTech - UObject - Nov 8, 2021ResolveName will replace the subobject delimiter (colon) with two periods. This increases the length of the string, and can cause asserts due to the string exceeding NAME_SIZE even when the name was ...
Nullptr dereference in FHeadMountedDisplay::UpdateSplashScreen()
UE - Platform - XR - Apr 5, 2017A customer has had problems running a game with a splash screen when passing -game flag to the editor. UpdateSpashScreen will call GetCurrentFrame, which can return a nullptr but fails to verify it ...
[CrashReport] UE4Editor_CoreUObject!UStruct::IsChildOf() [class.h:373]
UE - Gameplay - Jan 24, 2018Comments from users:I pressed Play while having a directional light selected in-editorChanged landscape collision mip level. ...
[CrashReport] UnrealEditor-Engine!UStaticMeshComponent::BuildTextureStreamingDataImpl
UE - World Creation - Worldbuilding Tools - Feb 28, 2022Generated from CrashReporter ...
Assert running Datasmith from Blutility via a Commandlet
UE - Editor - Content Pipeline - Datasmith - Importer - Aug 6, 2018Launching the Editor/Datasmith from Blutility via a Commandlet that is importing a .stp file causes the Editor to not launch with an assert. ...
Check inside FAssetSourceControlContextMenuState/FPerforceSourceControlProvider
UE - Editor - Workflow Systems - Oct 31, 2023The async execution from within the context menu state is not cancelled properly when closing the context menu. This means that when rapidly opening and closing context menus there will be corruptio ...
CreatePatchLibrary is broken
UE - Rendering Architecture - Shaders - Nov 12, 2025It seems the FEditorShaderCodeArchive.LoadExistingShaderCodeLibrary missed some functions, use FEditorShaderCodeArchive.AddShaderCodeLibraryFromDirectory instead could fix the issue. ...