Unreal Engine Issues
Unreal Engine Issues
Android.NewKeyboard CVar doesn't work
UE - Platform - Mobile - Jun 1, 2017Android.NewKeyboard cvar doesn't behave as documented. ...
Directx12 crashes with OOM
UE - Graphics Features - May 7, 2018In editor, when running a task that does not issue a BeginFrame/EndFrame for a long time, the GPU will eventually run out of memory. See UDN: https://udn.unrealengine.com/questions/431450/directx1 ...
Collision problem in nativized blueprint
UE - Simulation - Physics - Jan 29, 2019Issue reported by one of our licensee on the Japanese UDN https://udn.unrealengine.com/questions/480660/view.html ...
Spline Component Array Logic resulting in "Editor soft lock"
UE - Gameplay - May 6, 2019ReRunConstrictionScripts() on Tick() is causing an Editor "Soft- Lock" slow-down, When dragging a Spline Actor created from Blueprint; which utilizes custom construction script logic detailed in the ...
Instanced static meshes fire an erroneous performance assert about loose parameters.
UE - Graphics Features - Sep 4, 2019"This ensure is intended to catch regressions where rendering programmers add a loose parameter to LocalVertexFactory, breaking dynamic instancing on regular static meshes. InstancedStaticMeshes c ...
HLOD lightmap lost after level reopening with "save LODActors to HLOD Packages" option in project settings is on.
UE - World Creation - Worldbuilding Tools - HLOD - Jan 11, 2022[AI] Fill Collision Underneath for Navmesh does not work for ISM instances
UE - AI - Navigation - Sep 29, 2023Although the ISM component allows for enabling the flag for Fill Collision Underneath for Navmesh, it does not add the modifier for this to the navigation data for its instances. ...
Editor Crash when changing Default Properties of a TArray of UStucts containing an InlineEditConditionToggle property in Blueprint Parent Class
UE - Editor - Workflow Systems - Apr 5, 2024This bug causes an editor crash. This crash occurs when changing the default values of a UStructs properties that are used as EditConditions, when they are set to InlineEditConditionToggle within a ...
Global SkyAtmosphere and Clouds Issues (Ambient Light)
UE - Graphics Features - Dec 3, 2024Ambient Light on Volumetric Clouds from Sky Atmosphere always is calculated as if the clouds are at the north pole of the planet. Using a sphere-shaped Sky Atmosphere and Volumetric Clouds causes t ...
Light Leak Issue in Modular Buildings (Lumen HZBTraversal)
UE - Graphics Features - Lumen - Oct 14, 2025Starting in Unreal Engine 5.6, disabling "r.Lumen.ScreenProbeGather.ScreenTraces.HZBTraversal" can lead to light leaking between adjacent or overlapping meshes. Also tested on Release-5.6, CL: 4523 ...