Enable Slate layout caching Will cause the Stop/Play Buttons to disappear

UE - Editor - UI Systems - Slate - Dec 17, 2018

When using the command Slate.EnableLayoutCaching 1, The Play button is removed from the tool bar after exiting play. ...

Hair shading emits light when Lumen is enabled

UE - Graphics Features - Jun 6, 2022

This artifact does not occur when Lumen is disabled. Also, moving Roughness closer to 1 will reduce the effect. ...

All Megascan asset libraries are missing

TM - Core - Oct 15, 2025

All Megascans assets no longer appear in Twinmotion 2025.2 hotfix (46767548). Other libraries do not appear to be affected. ...

Project crashes when exiting mobile preview

UE - Gameplay - May 27, 2015

User project crashes when exiting from mobile preview. Frequency: 5/5 Crashreporter: [Link Removed] ...

Sequencer: Undoing creation of a new section can call section drawing code with viewmodel tree in invalid state

UE - Anim - Sequencer - Aug 1, 2024

The Section reference in ISequencerSection::GetSectionHeight can be in the process of garbage collection during an undo of a section addition- this causes things like GetTypedOuter<UMovieSceneTrack> ...

Expose Component Replication in ActorComponent

UE - Gameplay - Aug 9, 2016

UActorComponent has hideCategories=(ComponentReplication) set in the UClass macro preventing uint32 bReplicates:1; to be set as a default setting. ...

GearVR crash with material using Fresnel or WPO on Snadragon S7

UE - Platform - Mobile - May 19, 2016

Talking with ChrisB, this has been passed to Samsung and Qualcomm for investigation with the Signal 11 crash. This only affects the Snapdragon S7 devices. ...

Setting Alpha on RigidBody node results in bone displacement

UE - Simulation - Physics - Jan 31, 2017

If the user sets the Alpha channel on the RigidBody node to something between 0 and 1, this can result in some bone displacement. ...

Undo rename of Anim Curve in Curves section below viewport causes all curves to disappear

OLD - Anim - Jun 12, 2017

The anim curves in the Curves section below the viewport disappear when undoing the renaming of one. This does not occur in 4.16.2 ...

[CrashReport] Linux crash - FStatsThreadState::ProcessNonFrameStats

UE - Platform - Linux - Sep 21, 2017

This is a somewhat common Linux crash that has occurred since 4.16. The callstack shares some similarities to [Link Removed] ...