Ensure condition failed: PrimitiveComponent tried to render with Material MaterialInstanceDynamic, which was not present in the component's GetUsedMaterials results

UE - LD & Modeling - Terrain - Landscape - Feb 22, 2017

Top 10 ensure in 4.15. There was a fix submitted for [Link Removed] which was verified as following those steps to reproduce no longer causes this. ...

Renaming a Blueprint variable loses override in grandchild Blueprint

UE - Gameplay - Blueprint Compiler - Nov 26, 2019

Renaming a Blueprint variable loses override in grandchild Blueprint. Modifying and saving the BP_Child fixes the issue with BP_Grandchild losing overrides.  ...

Stationary directional light per-object shadows not working with origin rebasing

UE - Graphics Features - Dec 2, 2019

Not 100% clear if this is a bug or expected behaviour, but raising it as it needs looking it. Can't see it as fixed elsewhere. Confirmed broken in 4.24 too. ...

FFT corruption in bloom from sampling outside of viewport

UE - Rendering - Features - May 27, 2021

Licensee has suggested a fix: "Switching to >= resolves the problem: in GPUFastFourierTransform2DCore.ush, `bool InWindow = ...` at lines 127, 144, 170, and 185." ...

Splitscreen View2 influences translucency in view 1

UE - Rendering - Features - Sep 2, 2021

The videos + screenshots in the zip file show the issue on the modified gun sight. The licensee has provided a suggested fix here -[Link Removed] ...

No sound plays when using Built-In Spatialization or Simple ITD plugins

UE - Audio - Spatialization - Nov 10, 2021

No audio can be heard when using the Built-In Spatialization plugin. This is a regression from 4.26. Occurs in 4.27 and 5.0. ...

Closing editor after quitting a standalone game causes a crash.

UE - AI Workflows - UI Systems - Jan 4, 2022

The editor will produce a crash most of the time when closing editor after quitting a standalone game. This is a regression due to it not occurring in 4.26. ...

Image Media Source does not display properly on Mobile

UE - Media Runtime - Media Framework - Nov 17, 2021

Image Media Source does not display properly on Mobile Regression Unconfirmed, can't check issue in 4.26, because project can't be opened on that version. ...

Custom data update crash - invalid memory when removing an instance from a UHierarchicalInstancedStaticMeshComponent

UE - Engine Scaling - Streaming - HLOD - May 3, 2022

This is a race condition, did not crash with -onethread. Attached the collected threaded callstacks, although they look misaligned. Licensee has provided a suggested fix. ...

LevelInstance: Editor Texture Streaming (UDN)

UE - Engine Scaling - Streaming - Level Instances - Aug 14, 2023

Further investigate and fix Editor Level Instance texture streaming data update which currently isn't being updated when moving a Level Instance in the editor. ...