Adding ProceduralMeshComponent Class to a project prevents the code from compiling

UE - Gameplay - Aug 5, 2016

After adding a classed based on ProceduralMeshComponent the code for the project does not compile any longer. **This is a Regression - Adding ProceduralMeshComponent class would compile successfull ...

Packaged projects do not render in web page using Safari 10.0

UE - Platform - Mobile - Aug 9, 2016

My Macbook Pro uses an Nvidia GeForce 750M and was on Safari 10.0 when this occurred. This did NOT occur on a Macbook Pro with the same card and using Safari 9.1.2. This did NOT occur on an iMac wi ...

Crash occurs when importing attached FBX with default import settings

UE - Editor - Content Pipeline - Import and Export - Dec 22, 2016

While verifying a bug for 4.15 UE-39952 , I tried to repro in 4.14.2 and the editor crashed while attempting to import the attached FBX In 4.15, the Editor does NOT crash a window pops up stating t ...

Decal creates lighting artifacts on edge of meshes

UE - Graphics Features - Aug 22, 2017

When using deferred decals there are artifacts that are caused by the emissive color of the decal when viewing the decals from a low angle. These artifacts appear as thin lines on the edges of the m ...

Apex Cloth LOD distortion occurs after World Origin Rebase

UE - Simulation - Physics - Character - Sep 13, 2017

There is a distortion that occurs with Apex cloth when changing the World Origin location. This distortion occurs when you approach after the world origin has been changed. This issue is similar to ...

OnParticleCollide Not Returning Velocity Values Properly

UE - Graphics Features - Oct 23, 2017

OnParticleCollide doesn't return Velocity on every collision. User description: "If you add a particle emitter, and add an Event Generator - Collision and Actor Collision Binding an event to tha ...

[CrashReport] ispc_texcomp!<Unknown> - while launching to Android

UE - Platform - Mobile - Oct 25, 2017

This is an early crash coming out of 4.18 that appears to occur when launching projects onto Android devices. It also seems frequently related to ARCore. User DescriptionsSo this is the example pr ...

Reimporting an FBX file via the import button does not make the import options appear

Tools - Nov 28, 2017

Reimporting an FBX file via the import button does not make the import options appear. Instead of allowing the FBX to reimport with new options, the FBX just re-imports. This issue is a regression. ...

NetDriver time becomes unusable after long running sessions

UE - Networking - Jan 8, 2018

This issue has been around for a long time (potentially UE3). UNetDriver::Time is a float, which is updated by accumulating Delta Time during ticks. This means the longer a game runs, and the highe ...

Crash upon opening packaged game when Event Driven Loader is disabled

UE - Foundation - Core - Apr 26, 2019

Packaged games are unable to open when Event Driven Loader is disabled. The error message given is: Assertion failed: !Linker->GetSerializeContext() [File:D:\Build\++UE4\Sync\Engine\Source\Runtime\C ...