Unreal Engine Issues
Unreal Engine Issues
Incorrect Lumen Scene direct lighting when objects behind masked landscape
UE - Rendering - Features - Lumen - Oct 5, 2025When objects are placed behind or beneath a masked landscape and r.Lumen.HardwareRayTracing.SurfaceCacheAlphaMasking is enabled, the direct light evaluation is incorrect. There are two workarounds, ...
Absolute World Position post process no longer works in mobile preview
UE - Platform - Mobile - Sep 2, 2020User reports this work correctly in 4.24, but now no longer works as expected in 4.25.I don't have a clear CL just yet, marking unconfirmed. If you change the settings to use ES3.1 Preview and just ...
[CrashReport] Fatal error: Couldn't find shader - FMaterial::GetShader()
UE - Graphics Features - Jul 20, 2017This is a common crash affecting users in 4.16. User DescriptionsTried to edit the VivePreController Meshtried to edit SM_Skysphere after shaders had finished compiling. For no other reason than th ...
Editor crashes while switching to paint mode if material has a grass output and landscape visibility mask
UE - LD & Modeling - Terrain - Landscape - Aug 10, 2016Editor crashes while switching to paint mode if material has a grass output and landscape visibility mask. Frequency: 3/3 ...
Adding a new macro to a Blueprint Macro Library after renaming the first macro causes a crash
UE - Framework - Blueprint - Mar 17, 2022It seems the editor crashes when adding a new Macro to a Blueprint Macro Library. This only occurs if you rename the macro that gets automatically created when you open the macro library to somethin ...
StartCameraFade() breaks on mobile projects after editor is closed/reopened
UE - Platform - Mobile - Oct 6, 2015If a project that is set to Mobile/Tablet and Scalable 3D or 2D uses StartCameraFade() to produce a fade in effect, the effect will not play in PIE if the editor is closed/reopened. ...
Sky Lights don't effect Translucent materials
UE - Rendering - Architecture - Materials - Nov 21, 2022Regression: Tested in UE5/Release-5.0, this issue does not occur so it is a regression Appears to be an issue with Lumen and Skylights with Cubemaps. Directional lights, point lights, etc. all work ...
Crash in AWorldDataLayers::InitializeDataLayerRuntimeStates() when quickly unloading then loading a sub-world partition
UE - Engine Scaling - Streaming - Data Layers - Mar 6, 2025From licensee: Since we integrated 5.5, we are experiencing a crash in AWorldDataLayers::InitializeDataLayerRuntimeStates() on this line check(ActiveDataLayerNames.IsEmpty() && LoadedDataLayerN ...
Crash when adding Actor Components to a Spawnable Actor in Sequencer while it is despawned
zComponent - Archive - Feb 26, 2026After migrating our project from UE 5.5 to 5.7, we are experiencing a consistent engine crash in the Sequencer. The crash occurs specifically when a user attempts to add a component to a Spawnable A ...
The VertexInterpolator connected to a Normalize node, input into BaseColor results in black Mesh LOD Coloration
UE - Rendering - Architecture - Materials - Nov 16, 2021It does not appear to matter to the repro steps what is input to the VertexInterpolator, it matters more that there is a Normalize between the VertexInterpolator and the base color input of the mate ...