Unreal Engine Issues
Unreal Engine Issues
bIsComposing assert with Japanese MS-IME input(candidate list related)
UE - Editor - UI Systems - Localization - Apr 18, 2017When using MS-IME as Japanese input method, scrolling out the text field out side the view causes bIsComposing to be set false - this state causes instability of the editor. Crash happened with Win ...
Incorrect usage of FText in EnsureMsgf does not trigger a compilation error, leads to crash in shipping
UE - Foundation - Core - Mar 1, 2018Using incorrect formatting in FText does not cause compilation errors in EnsureMsgf as it does in other functions such as UE_LOG. This causes crashes to sneak through such as a crash on ensure when ...
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 ...
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 ...
Show Flags are changed to the state that they were set on editor startup when switching to a different level
UE - Graphics Features - Jun 15, 2018Show Flags are changed to the state that they were set on editor startup when switching to a different level It appears that the state of Show Flags are stored in the editor on shut down, this is c ...
Inconsistent media texture new style output state across the engine
UE - Media Framework - Jun 20, 2023A simple search for `NewStyleOutput = true` will reveal the many instances where this flag is already forced on, including media plates and media bundles. This however means that we have incompatib ...
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 ...
Adding a StaticMeshComponent pointer to a derived StaticMeshComponent class has inconsistent behavior
UE - Gameplay - Components - Aug 6, 2015Adding a UStaticMeshComponent pointer to a class derived from StaticMeshComponent allows for two meshes to be set by a single component. Setting two meshes inside a blueprint this way will only allo ...