Unreal Engine Issues

StaticMesh->RenderData->LODResources[0].IndexBuffer empty in Standalone games.

GetArrayView is returning incorrect values in Standalone games. The correct values are returned when played in Editor. ...

Dangerous Casts in Editor Modes

User found that our editor mode functions don't do static casts, and thus you can cast to classes that don't share a common base class with the pointer class we're casting from, resulting in some na ...

Striped Stencil Artefacts across scene under OS X using ATi 4xx0 GPUs

From AnswerHub: Lighting problem [Mac] I am currently testing UE4 on a Mac at my college, but there are these strange lines where light is being cast onto surfaces. I'm currently wondering if this i ...

Using the "-opengl" commandline argument on a client project will trigger an Access Violation breakpoint.

Running a client in debug mode in Visual Studio with the "-opengl" commandline argument will trigger an Access Violation breakpoint. ...

Visual glitches on Mac OS X using an Intel GPU while playing HW accelerated H264 video

This looks to be a system driver bug, but logging here for transparency and future reference. It took me a long while to figure out that the key issue is a conflict during blit between UE4 and the H ...

ElapsedTime is very inaccurate (uses timer to update)

Opacity is not receiving Input for Material Functions

Opacity is not working with a material function "Make Material Attributes" node. ...

WalkableSlopeOverride does not work for individual skeletal mesh body shapes

Walkable slope override (per-instance override of walkable angles for characters) is not used if edited per shape on the body. ...

Reflection Capture Crash, LPV related

UE4Editor_Renderer!FDeferredShadingSceneRenderer::RenderLights() [d:\usr\test\ue4\engine\source\runtime\renderer\private\lightrendering.cpp:551] UE4Editor_Renderer!FDeferredShadingSceneRenderer::Ren ...

UAIPerceptionStimuliSourceComponent never registers with required senses

UAIPerceptionStimuliSourceComponent::OnRegister tries to remove nulls from RegisterAsSourceForSenses but the condition in RemoveAllSwap is wrong. It should be SenseClass == nullptr instead. ...