Crash when unplugging the Oculus Rift HMD while level is loading

UE - Platform - XR - Jan 12, 2017

If the user unhooks their Oculus HMD (USB cable) from the PC while a level is loading the editor will crash ...

Landscape Layer blend node inconsistency

UE - LD & Modeling - Terrain - Landscape - Mar 24, 2015

When the landscape has no textures the landscape layer blend material node will render as the first layer. When painting only holes onto the landscape, the landscape will have a layer texture but st ...

Collision Channel on Particle Systems not saving

UE - Graphics Features - Oct 21, 2014

Setting the Collision Channel to anything other than World Static will reset on closing and restarting the editor. ...

Deferred Decals Fade In With No Fade Duration Set

UE - Graphics Features - Aug 9, 2019

Decals fading in with Fade Duration set to zero. Found in 4.21 CL# 4753647, 4.22 CL# 7053642, 4.23 Preview 5 CL# 7838574 ...

Creating Destructible with PhysXLabs and Fracture Tool in UE4 yield different results and same settings

UE - Simulation - Physics - Destruction - Feb 25, 2015

When creating fracturing a mesh in PhysXLabs vs UE4 fracture tool with both using Voronoi fracture and set to 25 chunks will give different results. The mesh (Attached below along with reference i ...

r.SupportPointLightWholeSceneShadows Set to False Causes Crash When Trying to Place a PointLight

UE - Graphics Features - Jul 25, 2018

If you disable Support PointLightWholeSceneShadows and try to place a point light in a level the editor will crash.  Current work around is put shadows to low from engine scalability settings. Wor ...

Hot reloading with a plugin in the project prevents the project from being able to save.

UE - Foundation - Core - Jul 8, 2015

Hot reloading a project that includes a plugin will not be able to save if the plugin is used in the project. ...

Player spawn inconsistent depending on HMD rotation

UE - Platform - XR - Sep 11, 2017

When starting VR preview with the headset with it's face down, it will start at a difference height than if the headset it facing with its face perpendicular to the desk/floor ...

Objects moved by Matinee that is paused or stopped retain non-zero ComponentVelocity

UE - Gameplay - Player Movement - Apr 28, 2016

Jumping off an object moved by a matinee that is stopped during movement will impart a velocity to the character, even though the object appears to be stopped. This is because ComponentVelocity is o ...

Replicated Timelines Update runs once for Clients when you change its Play Rate

UE - Networking - Apr 22, 2022

See linked UDN for more info. This looks to be because of how OnRep_Timeline handles any changes to the component's FTimeline struct. If the timeline isn't playing, OnRep_Timeline will call SetPlayb ...