Anisotropic metallic material and area lights don't work

UE - Graphics Features - Substrate - Jun 28, 2023

Additive Pose Asset arms become over exteneded when blended with reference pose

OLD - Anim - Jan 27, 2017

Asset is praising the sun rather than having his arms straight out to the sides when blended with the reference pose. This is a regression from 4.14.3 ...

Blueprint editor can crash on removing one of a Sequence node's exec pins

UE - Gameplay - Blueprint Editor - Dec 22, 2023

User reported that upon removing a pin from a Sequence node the editor crashed. This only happened once, so may be a multithreading race condition or there may be additional unknown factors. The cra ...

5.4, FRHIMemoryPool leaks memory

UE - Rendering Architecture - RHI - Feb 12, 2025

FRHIMemoryPool will leak data when it is destroyed. "FRHIMemoryPool::Init()" will create "FRHIMemoryPool::DesiredAllocationPoolSize" new "FRHIPoolAllocationData" objects, stored in "FRHIMemoryPool: ...

FX.TestGPUSort fails on Vulkan

UE - Niagara - May 5, 2025

“FX.TestGPUSort” fails on both PC Editor and Android with Vulkan RHI. ...

WorldContextObject is null in BP function library

UE - Gameplay - Blueprint Compiler - Aug 15, 2017

Arrays on multicast events called from the server are not passed to clients

UE - Networking - Jul 19, 2018

Arrays that are passed into a Multicast Event as an input are not available on clients who call the function Regression?: Yes This did not occur in 4.19.2 ...

FCanvasTriangleRendererItem relies on BaseVertexIndex not being zero.

UE - Rendering Architecture - RHI - May 20, 2019

The root of this issue is that FLocalVertexFactory is doing manual vertex fetch in the shader. In HLSL, this relies on SV_VertexId. In GLSL, it's gl_VertexId. HLSL does not include the base vertex i ...

"Pausing" A TimeSynth causes a crash

UE - Audio - Oct 10, 2019

Clicking and holding anywhere on the editor outside the viewport when PIE causes a crash. The AudioRendering thread throws the following assert: Assertion failed: FreeClipIndex < PlayingClipsPool_Au ...