Unreal Engine Issues

Jitter playing animation on actor located far from origin

A licensee has reported an issue with jitter when playing animations on an actor translated far from the origin (300000.0 units).  This repros on the First Person Template.  The issue is more obviou ...

Playing two instances of the same level sequence with an audio track will not work as expected.

Two instances of the same level sequence playing audio will cause the audio to stop playing. ...

Crash during shader compilation when r.Shaders.Optimize=0

The primary shader crashing is "FVisualizeLumenSceneCS" which I've put in the callstack section, but I think this is more likely a binding problem as I'm also see the following crash with cloud shad ...

CharacterMovementComponent: simulated proxy can go into falling due to linear velocity quantization when using custom gravity

The character movement component in  void UCharacterMovementComponent::SimulateMovement(float DeltaSeconds) evaluates whether to find the floor when simulating the movement of the simulated proxy ...

Materials with transparency still visible in alpha with holdout in Render layers.

The Transparent materials like the Glass don't behave correctly in Raster (in PT is working as expected).  They are visible in Alpha with Holdout.  This is an Engine limitation for now. But we sho ...

Enhanced Input Action Key Remapping maps old mapping over incoming mapping in an unintuitive way

On EnhancedInputSubsystemInterface.cpp:1040, RebuildControlMappings has a check to preserve mappings for identical action key maps. In most cases, this appears to work correctly; however, in the cas ...

PostLoadGroup can cause materials to cache GWhiteTexture into uniform expressions

It may occur that during loading screens, materials using material layers will load with GWhiteTexture before the real textures are ready. This seems to be because of a race condition due to PostLoa ...

TakeRecorder does not add a track to a level sequence when niagara FX is spawned

In UTakeRecorderActorSource::EnsureObjectTemplateHasComponent() function, MakeUniqueObjectName() generates the same name of a component which CachedObjectTemplate for TakeRecorder has already had. T ...

Certain Niagara particles can disappear after switching to the debug cam

When duplicating multiple actors with alt+drag, Translation/Rotation widget goes to incorrect coordinate space

Note: This bug has been observed in all tested engine versions, from UE 4.24 to UE 5.3 and in ue-main. When shift+selecting multiple actors in the Level Editor, the currently-active transformation ...