Editor Crashes When a Component and Actor Implement Two Interfaces

UE - Gameplay - Blueprint - Oct 16, 2015

The editor crashes if you implement two blueprint interfaces in an actor blueprint, and then an actor component blueprint. These interfaces must have at least one function that returns a value. The ...

Reimport for a single FBX with multiple meshes will add all mesh pieces instead of the single mesh.

Tools - Nov 21, 2016

When using a single FBX with multiple meshes that is imported as individual meshes, if you reimport after updating only a single mesh or a few of them the entirety of FBX will be imported and added ...

CDO is not properly updated on Hot Reload causing "ghost" code.

UE - Foundation - Cpp Tools - Hot Reload - Jan 10, 2017

When a hot reload is preformed, the CDO is not properly cleared. This causes a copy of the class to be generated with both the original and copy triggering calls. Workaround: Preforming an additio ...

Material Reroute nodes do not work for Texture Object Parameters

UE - Rendering Architecture - Materials - Mar 31, 2017

The reroute node is throwing an error why you try to using it with a Texture Object Parameter. It works just fine without the reroute node so the workaround is simple enough. ...

Material Preview for Post Process Material Does not display in Material Editor

UE - Graphics Features - May 19, 2017

In the Material editor for when working with a Post Process Material, the material does not appear in the preview window. Regression: This issue does not occur in 4.15.2 Binary Builds ...

Loss in Specularity on Skin Shading when Shadowed by Indirect Capsule Shadows using r.sss.checkerboard 0

UE - Graphics Features - May 23, 2017

A licensee is reporting incorrect or over exaggerated loss of specularity on the Subsurface skin shading model when shadowed by indirect capsule shadows, and then modifying the r.sss.checkerboard se ...

[CrashReport] UE4Editor-Kismet.dylib!FTabInfo::OnMouseDownHisory(FGeometry const&, FPointerEvent const&, TWeakPtr<SMenuAnchor,()

UE - Platform - Apple - Jul 20, 2017

This is a common crash affecting Mac users in 4.16. It has occurred since at least 4.13 ...

Material Editor Tooltips for Sine and Cosine Expressions are Incorrect

UE - Rendering Architecture - Materials - Dec 11, 2017

The tool tips for Sin and Cosine within the material editor need to be modified. The tool tips are inconsistent and do not match the information in official documentation. [Link Removed] ...

Vive: Trigger haptic has a low chance to not play

UE - Platform - XR - Feb 17, 2018

Occasionally the haptics will not response to a trigger pull on the vive wands. It's about 2/15 will skip response. ...