Disabled Skeletal Mesh Sections cause Shadow Ray Tracing Flicker

UE - Rendering - Graphics Features - Ray Tracing - Dec 12, 2025

If a skeletal mesh has a section disabled the ray traced shadow will flicker when the camera or itself moves. Previously in 5.6.0 no raytraced shadow would appear if a section was disabled. This wa ...

VirtualTextureStreamingPriority cannot be set per TextureLODGroup

UE - Rendering - Architecture - Dec 11, 2025

It is currently not possible to set a VirtualTextureStreamingPriority via the TextureLodGroups that are defined in a device profile. ...

Convex hull generation fails when first 3 verts are colinear

UE - Simulation - Core - Dec 9, 2025

The licensee identified a number of cases where loading assets will trigger convex hull generation warnings:If the first 3 verts in the set are colinear (in which case IsPlanarShape() returns true b ...

Virtual texture thumbnails appears brighter (incorrect sRGB/gamma) in content browser after asset is loaded

UE - Editor - Dec 9, 2025

This is a regression, it worked correctly up to UE 5.5 but behaves incorrectly in UE 5.6 up to latest. When a regular texture with sRGB enabled is converted to a virtual texture, its thumbnail in t ...

Provided example Control Rig Python scripts that feature calls to GetControlRigBlueprint need to be updated to GetControlRigAssetInterface.

UE - Anim - Rigging - Control Rig - Dec 9, 2025

The unreal.ControlRigContextMenuContext.get_control_rig_blueprint() this function has been deprecated in Unreal Engine 5.7. As a result, the Python scripts included with the Control Rig plugin no ...

Texture Streaming can randomly streams in all Mips, causing large memory spikes

UE - Rendering - Architecture - RHI - Dec 5, 2025

A possible race condition allows texture instance views to read uninitialized bounds, causing either garbage or zero screen size values to be returned by FRenderAssetInstanceAsyncView::GetRenderAsse ...

Drag and Drop fails in Standalone and Packaged builds when WidgetComponent’s Widget is set at runtime

UE - Editor - UI Systems - Dec 4, 2025

When a UWidgetComponent has its widget assigned dynamically at runtime using CreateWidget and SetWidget, drag & drop operations fail in Standalone Game and packaged/game builds, while working correc ...

LI Property Override: LI internal references are broken when saving the overrides.

UE - World Creation - Worldbuilding Tools - Level Instances - Dec 4, 2025

When Saving the level, ULevelInstancePropertyOverrideAsset::SerializeActorPropertyOverrides will run UStruct::SerializeTaggedProperties to "diff-serialize" each object against its archetype (the LI ...

Crash on 5.7 when running with the Vulkan RHI and async compute

UE - Rendering - Architecture - RHI - Dec 4, 2025

Making this a placeholder for now. Will fill out the description asap ...

Issue with Niagara emitter inheritance

UE - Niagara - Dec 4, 2025

Modules in the particle spawn stage get unlocked and lose inheritance after changing the inherited emitter's interpolated spawn mode to "No Interpolation" then resetting. ...