Unreal Engine Issues

Editor freezes up when dragging the scroll bar of the Visual Logger window when a bvlog file isn't loaded

When adjusting the scroll bar in the Visual Logger window, the editor freezes up. There is no callstack provided in the logs. The only way to close the editor at that point is to close it through th ...

Crash when setting Kill Particles to true on some emitters in a Niagara System

When setting the Kill Particles boolean of an emitter in a Niagara System to true, the editor crashes. So far, I've only been able to reproduce the issue with the NS_EH_KP system that a user provide ...

Stacked shots will evaluate both sub sequences instead of just the topmost

Overlapping shots will evaluate all shots instead of the topmost one. ...

StaticMesh - CustomDepth breaks occlusion culling without custom depth enabled

Handheld AR: Session fails to Start after minimizing/backgrounding the application

When the user minimizes or backgrounds an AR application, and re-opens it, new AR sessions will fail to start ...

InstancedStaticMesh displaying corrupt lightmap data

I think I narrowed this issue down to bad UV coordinates being interpreted during the BasePassVertexShader execution applied to instancing. At this line in VertexFactoryGetInterpolantsVSToPS: flo ...

Crash in editor when loading a procedural mesh that has multiple sections and raytracing is enabled

Crash on multi viewport when streaming in sub level with rect lights

Very thin meshes cause flickering with emissive materials.

The licensee has reported that when you make a mesh extremely thin (e.g. z = 0.0001), it can cause emissive materials applied to the mesh to flicker. ...

Crash when adding an Event Write node to a Niagara Scratch Pad module

It seems that the crash is related to all of the "Write" events. I tested the Event ChaosDestruction Write, Event Float Write, and Event Bool Write and all 3 caused the crash, but their "Read" count ...