Unreal Engine Issues and Bug Tracker

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Latest Bugs

Lack of multi-bounce when using software traced lumen radiosity

UE - Graphics Features - Lumen

Certain Lumen Hardware Ray Tracing CVars, when disabled in isolation, will not fall back to tracing the Global Distance Field, because the Glo...

Video material previews incorrectly on Mac

Received multiple reports of users on Mac computers experiencing issues previewing video materials in Twinmotion 2025.1. When adding video ma...

Editor crash while saving asset during cook operation

It is possible to experience an editor crash in 5.5.4 when the cook process generates a warning that references an asset while the editor is s...

Rect light LTC textures fail to load when cooking with bSharedLinearTextureEncoding enabled

UE - Graphics Features

When running a build with bSharedLinearTextureEncoding enabled, View.GGXLTCMatTexture and View.GGXLTCAmpTexture are pointing at the black text...

Sky Atmosphere Material Nodes not Correctly Represented in the Surface Cache for Nanite Enabled Static Meshes

UE - Graphics Features

When nanite is enabled on a static mesh, lighting contributions from Sky Atmosphere material nodes are not incident on the static mesh and no ...

Latest Fixes

When using 'r.VT.SplitPhysicalPoolSize 64' with nanite meshes, mesh painting does not update in real time (only updates after stroke finished), duplicates mesh painting across separate instances of a mesh, and sometimes doesn't show up in PIE.

UE - Rendering Architecture

When using Mesh Painting on nanite meshes in 5.5 with 'r.VT.SplitPhysicalPoolSize' set to non-zero values (e.g. 16, 64), several issues occur,...

[MetaSounds][Builder API] - Editor crashes when setting node position to a large value

UE - Audio - MetaSounds

Setting the location of a node a the MetaSound Editor Subsystem to a very large value crashes the editor.Unhandled Exception: EXCEPTION_STACK_...

Some features have not yet been supported when using AmbientCubemap as IBL

UE - Graphics Features

Translucent materials do not receive specular highlights and reflections from Ambient Cubemaps set in Post-Process settings. There is a pass"...

Improve time slicing of UWorld::RemoveFromWorld (RouteEndPlay pass and post-RouteEndPlay pass)

When a Level is being removed from world (UWorld::RemoveFromWorld), the time slicing (time limit) is not respected especially if the EndPlay o...

Missing libomp140 DLL causing crashes in Hair Card Generator plugin

EA Motive has run into a crash when using the hair card generator plugin. A missing DLL is preventing them from creating hair cards according ...