Unreal Engine Issues

RigVMRegistry : The registry is not locked for writing yet : ensure statement error during cook

I am seeing an cook failure at the very beginning. It goes away with a retry step via Horde. Please find attached call stack. I am able to consistently reproduce it by wiping all the DDC cache and ...

Precision issues with 16-bit Skin Cache shaders.

A licensee reported precision issues with position in the gpu skin cache shaders with 16-bit real types enabled. ...

Negatively scaled box collisions render back faces in Player Collision debug view

The player collision debug visualization for negatively scaled boxes is rendering the back faces, not the front faces. The debug primitives are rendered via the dynamic mesh builder. FDynamicMeshBui ...

When ControlRig.EnableAnimNodePerformanceOptimizations is enabled, the default pose briefly appears after the Control Rig is reinitialized

Since UE5.6, ControlRig.EnableAnimNodePerformanceOptimizations is enabled by default, and this appears to be causing the issue. Specifically, when the control rig’s construction event is processed, ...

Crash when running "MAP REBUILD ALLVISIBLE" with hidden sublevels and then changing maps

Running the MAP REBUILD ALLVISIBLE editor command when the current map contains hidden sublevels causes a crash upon changing maps. The issue seems to be related to hidden sublevels being cleared in ...

Hardware Lumen Surface Cache Artifacts on Nanite Geometry

When using Hardware Lumen with Nanite-enabled meshes in UE 5.6+, black / dark surface cache artifacts appear that result in generally darker and unstable lighting. These artifacts are not immediatel ...

GeometryCollectionPhysicsProxy::FieldParameterUpdateCallback() not removing invalid Commands, leading to performance issues

GeometryCollectionPhysicsProxy::FieldParameterUpdateCallback() not removing invalid Commands, leading to performance issues. The licensee has provided their analysis: We seem to have stumbled acro ...

Material Particle SubUV Sample does not work with Tex Object

The Particle SubUV Sample node uses its own texture object reference instead of the one provided by the texture object node. ...

Crash When Loading Cooked Material Assets in Editor Due to Shader Serialization

In Unreal Engine 5.6+, the new shader serialization logic in FShaderMapResourceCode::Serialize does not correctly handle cooked assets that are loaded back into the editor (e.g., from a mounted .pak ...

Volumetric lightmap cache point becomes extreme bright if the light source is accidently at the exact(or almost) location of it