Unreal Engine Issues

Fix up IOS errors calling UI API from non-UI threads

TSR fix excessive flickering when subpixel details are in history but not input image

Put fix for UE-39713 into 4.14.3 (Memory leak in GPURealloc)

Fix iterative cooks to keep track of CookAdditionalFiles and delete them when the package file that created them is invalidated

A licensee reports they are using the CookAdditionalFilesOverride function in UObject to add files to the project. This file is properly copied into the Staging area during Packaging, and is appropr ...

Make Custom Event names start with "Event"/Fix "Event Event" issue with overridden Events

If you name an Event something like "Event Foo", overriding the event in a ChildBP gives you "Event Event Foo" To avoid this, please make Custom Event names Start with "Event" ...

Fix MM node "Yaw From Animation Blend Rate" for skeleton with root bone rotated X or Y up

Crash on Adding Elements to Array On Instance of Actor in the Level

When attempting to add an array element to an array that exists on a component contained within an actor that is instanced in the level, the editor will crash. This does not occur if an array elemen ...

Previewing Node in Material Editor Produces Unexpected Output with DX12

Per Licensee: Since we switched to DX12 we started to see strange behavior in material previews. I was able to reproduce the problem in UE 4.19 vanilla as well. We usually have to force recompilin ...

Opening Materials and Material Functions with Vertex Interpolator node Results in Crash

Per Licensee: Hello, We are migrating our project from 4.18 to 4.19.2 and we are encountering various crashes while opening our material and material functions. I'm adding a simple test case here. ...

Actor Component Replication Not Working on Dynamically Spawned Components in Blueprint

Actor components that are spawned dynamically through Blueprint are not being properly replicated to the client.  Found in 4.20 CL# 4233996 and reproduced in 4.21 Main CL# 4258917 Unable to test i ...