Unreal Engine Issues

Groom/hair "exploding" in multiplayer mode (PIE Listen Server + 2 Players)

Control Rig: Setting the components of a Vector in the graph can overwrite the default values of other variables

It seems that setting the component values of a vector via a Set node in Control Rig can effect the default values of other blueprint variables in the Control Rig. See the attached video for more d ...

Crash when using the Blueprint merge tool

The Editor crashes when merging a change using the Blueprint Merge tool on Linux.  ...

Invalid object while verifying cluster assumptions during ShooterGame replay with matinee actor

This seems to be caused by the matinee actor on Highrise and only appears to be reproducible in a packaged build of ShooterGame, not from the editor. See attached UDN for more information. ...

Material cannot be set in MaterialInterface of NiagaraParameterCollection

When MaterialInterface is added to UserParameter of NiagaraSystem, Material can be set in Properties. Also, in UE4main CL15988344, there is no MaterialInterface item in the NiagaraParameterCollecti ...

Strange performance when adjusting r.ScreenPercentage

A UDN user has reported strange performance characteristics with occlusion queries / lights when using screen percentage. It appears using a higher screen percentage is faster; the user attached a s ...

Incorrect AO rendering when that using SSGI.HalfRes

This problem seems to have started from 4.26. Also, setting r.DiffuseIndirect.Denoiser=0 will increase the noise but invisible the rendering in problem. ...

Inversing the scale of a skeletal mesh when it's simulating physics results in the mesh and collision being flipped

The attached project has 3 skeletal meshes. One with its original transform and then 2 copies with an inversed scale in the X axis for one and the Y axis for the other. When pressing play, the meshe ...

Scaling sphere with gizmo causes it to not work with line trace

Changing the scale of an actor with the level editor gizmo follows a very different codepath than changing it via the details panel. A side effect of this seems to be that line traces will no longer ...

[Device Swap][Crash][Stadia] - Crash changing audio device from 5.1 to stereo

There's a crash on stadia when changing the audio device from 5.1 to stereo. There's also a related issue where voice chat breaks when changing from 5.1 to stereo. The background is that CL14889950 ...