Material Editor Viewport not updating correctly

UE - Graphics Features - Mar 9, 2015

When a user changes the value of an inputted node into the material editor, the viewport changes to the world default material as per normal but never recovers to the newly compiled material. Savin ...

Matinee: Animation keyframes cannot be added after opening a new asset editor in the same window

Tools - May 31, 2016

When opening a new asset editor in the same window as matinee, the 'Add Key' button for animation tracks will no longer function. This is due to FSlateApplication::ActiveTopLevelWindow being reset a ...

Renaming blueprint function input is not respected until the user compiles

UE - Gameplay - Blueprint Editor - Oct 14, 2016

If the user renames a function input, and then adds the function into a graph, the function node will not use the new input name. The user will need to recompile and then add the function back into ...

Editor freezes when using multiple Post Process Volumes with Cubemaps assigned

UE - Graphics Features - Jun 13, 2016

When using a cubemaps assigned to a Post Process Volume and loading the level the editor will freeze if it's been a project converted from 4.11 to 4.12/4/13. In some instances if the camera is outsi ...

Sync'ing an asset through the editor does not update the asset until the project restarts

If an asset file is checked out / edited in source control and checked back in, others will see the yellow exclamation mark to indicate that there is an update to the asset but choosing to sync does ...

BP - Exclusive nativization will fail at cook time if an Actor BP class enabled for nativization includes a Component BP that's not enabled for nativization in its component list.

UE - Gameplay - Blueprint - Apr 26, 2017

This happens because the Blueprinted component is not also enabled for nativization, but the nativized Actor BP tries to use it as a native class type. Current workaround: Ensure that the Blueprint ...

Light leak on mesh when in shadowed area

UE - Graphics Features - Nov 8, 2017

When Cast Shadow and Self Shadow Only in the Lighting Section of the Details of a mesh, the light will randomly hit the mesh even though it is in a shaded area. Light appears to flicker and will com ...

Sleep state not replicating properly

UE - Simulation - Physics - Jul 30, 2019

Objects' sleep states are not being properly replicated to the client. While it cant seem to be reliably triggered, occasionally the client will receive a constant stream of sleep events, until the ...

Bright Flickering or Black Squares with Rectangle Lights Intersecting Meshes

UE - Graphics Features - May 31, 2024

Rect Lights that intersect geometry can produce NaN pixels in SceneColor, which will affect bloom, FXAA, and other future passes. This can lead to large visible artifacts. The NaN values are produc ...

Sound plays twice when switching camera modes

UE - Audio - Aug 7, 2015

Playing a sound (firing weapon) and switching the camera mode will cause the gunfire sound to play twice, once from the weapon's position when it's fired and again as through the sound was coming fr ...