Crash when using the Blueprint merge tool

UE - Gameplay - Blueprint Editor - Apr 26, 2021

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

UCanvasRenderTarget2D crashes on some video cards if the BGRA format is selected

UE - Graphics Features - Apr 26, 2021

The reason for the crash is that the underlying resource uses DXGI_FORMAT_B8G8R8A8_TYPELESS, and UAV support for that format is optional. UCanvasRenderTarget2D sets bCanCreateUAV to true always, wit ...

Force Feeback Attenuation assets can't be created in the editor

UE - Gameplay - Apr 22, 2021

ForceFeedback Attenuation assets aren't an option because they are filtered out of the list  in UAssetToolsImpl::IsAssetClassSupported. This happens because there isn't a valid AssetTypeActions clas ...

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

UE - Anim - Sequencer - Apr 21, 2021

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. ...

Memory Leak With NullRHI

UE - Rendering Architecture - RHI - Apr 21, 2021

Adding a new component to a parent class breaks child Blueprints

UE - Gameplay - Blueprint - Apr 16, 2021

See UDN(308147): [Link Removed] ...

RemoveWindSource modifies game thread array while in a parallel for loop.

UE - Simulation - Physics - Apr 16, 2021

FScene::RemoveWindSource is called from a parallel for loop, and concurrently deletes wind component pointers from the same game thread array causing crashes when the scene contains multiple wind so ...

Retainer box widget causes progress bars to render incorrectly

UE - Editor - UI Systems - Slate - Apr 14, 2021

Retainer boxes are currently causing progress bars to render incorrectly. This looks to be related to [Link Removed] which is fallout from the changes to retainer widget transform calculation introd ...

Landscape Distance Fields artifacts when using DX12

UE - Graphics Features - Apr 13, 2021

This problem was reported in this UDN:https://udn.unrealengine.com/s/question/0D52L00005PbEYNSA3/landscape-distance-fields-artifacts?fromCase=1 ...

Collections in content browser can't display native classes on 4.26

UE - Editor - Content Pipeline - Content Browser - Apr 12, 2021

The filter in UContentBrowserClassDataSource::CompileFilter does not work because the enumerated class objects are FName without path, while the filter item is name with path. [Image Removed] ...