Implementing an interface in a blueprint does not show interface functions until interface is opened and compiled

UE - Gameplay - Blueprint - Aug 3, 2015

If an interface is implemented within a blueprint, the initial function in the blueprint interface cannot be called in the actor. The function will be populated after compiling the blueprint interfa ...

Add Actor Local Offset does not work for Client Characters

UE - Networking - Mar 31, 2015

Add Actor Local Offset does not work for Client Characters. The client attempts to move but is forced back to start, resulting in a jitter and not the intended movement. The same movement setup in a ...

Screen widgets with transparency are darker when displayed in an HTML5 environment

UE - Editor - UI Systems - Jun 8, 2015

If the user creates a widget blueprint and adds an image with transparency the image will appear slightly darker when launched in HTML5 (firefox nightlie in this test) ...

TSoftObjectPtr instance loses reference after ClientTravel

UE - Gameplay - Apr 3, 2018

If a TSoftObjectPtr on an instance has a reference to another instance in a level, that reference will be lost when a client travel is performed to travel to that level. Regression?: No This occurr ...

Duplicating a SetMaterialAttributes Node Causes Missing Attributes

UE - Rendering Architecture - Materials - Nov 5, 2018

Duplicate SetMaterialAttributes nodes will be missing attribute connections on the node itself, but in the properties tab they will show up. Found in 4.19 CL# 4033788, 4.20 CL# 4369336, 4.21 Previe ...

Material Instances do not stack in the Blendables Array for a Post Process Volume

UE - Graphics Features - Mar 24, 2015

Given two Material Instances of one material applied both to a Blendables Array only the second (last applied) will be applied to the post process volume. With the same setup, two Materials will st ...

Morph Target Preview Slider Defaults to One When Entered Value is Larger Than One

OLD - Anim - Jan 2, 2018

When morph target weight value is set to a number other than 1 the slider sets it back to being a value under 1. It does not go down from the number that it was set to but instead defaults to being ...

Assertion failed: PlatformNeedsExtraDeletionLatency()

UE - Rendering Architecture - RHI - Mar 5, 2019

Animating a HISM along a spline when many other HISMs are present will result in a crash in 4.22. Confirmed in 4.23 MAIN @ CL 5291468 ...

A repainted cloth mesh continues to use previous paint job and does not update

UE - Simulation - Physics - Character - Dec 20, 2019

Cloth mesh reverts back to original painted mesh after editing Tested:     4.23.1 CL#9631420 4.25 CL#10730208 ...

Keyboard shortcut for Snap to 2D Layer functions when Layer Snapping is disabled

UE - Gameplay - Paper2D - Jul 8, 2015

Using the Ctrl+Spacebar shortcut will snap an actor to a 2D layer even if Layer Snapping is disabled in the project settings ...