TrackFieldData and SubSectionFieldData structs not properly being serialized during cook in the Precompiled Evaluation Template

Sequencer - May 3, 2019

During compile on the fly if the evaluation field is invalidated SubSectionField data will not have been properly serialized and the meta data will not be populated correctly, as the custom serializ ...

Niagara GPU particles will always have a lifetime of one second if they use a Collision Module

Rendering - Niagara - May 2, 2019

GPU Particles will always have a lifetime of one second when using a collision module. This is a result of an issue with how off screen timing is handled. GPU particles that are off screen should on ...

Niagara Components can unregister themselves in the process of component registration

Rendering - Niagara - May 1, 2019

Spawn system attached with a system where bAutorDestroy is true and one data interface is invalid will crash the engine. ...

PVehicleDrive not null-ed in UWheeledVehicleMovementComponent::OnDestroyPhysicsState

Physics - Apr 30, 2019

PVehicleDrive is not null-ed during OnDestroyPhysicsState, which can lead to crashes during future function calls. ...

Assertion failed after closing project on Oculus Mobile - Referencing AudioMixerSourceManager.cpp:300

Virtual Reality - Apr 30, 2019

This assertion seems to occur when closing the project while a sound is playing on the device. Assertion failed: CommandBuffers[NextIndex].SourceCommandQueue.Num() == 0 [File:D:/P4Workspaces/Switch ...

FAnimInstanceProxy::LODLevel isn't initialized, causing UB in PreUpdate

Anim - Apr 29, 2019

FAnimInstanceProxy::LODLevel isn't initialized before it is used in PreUpdate, causing UB on the first call. ...

Widgets added via the user created section do not update when changes are made to the child widgets

Tools - UMG - Apr 29, 2019

When updating a widget's settings, those changes will not be reflected in the defaults of any instances where that widget has been used. ...

DevelopmentServerLauncher.exe loops whenever the editor is open even if no iOS devices are connected

Platform - Mobile - Apr 29, 2019

A user has reported that DeploymentServerLauncher.exe will continue to poll for devices even if no iOS devices are connected. I am under the impression that this is so that Windows can poll for iOS ...

Adding an LOD while in PIE or Simulate Cauases the Editor to Crash

Rendering - Cascade - Apr 29, 2019

If you add an LOD while the editor is simulating or playing, the Editor Crashes. Found in 4.20 CL# 4369336, 4.21 CL# 4753647, 4.22 CL# 5660361, 4.23 CL# 6063286 ...