macOS build appears to hang due to UBT deadlocking on ps buffer

DevTools - Apr 22, 2021

Licensee reports buffer deadlock issue in System/BuildHostPlatform.cs (lines 283-329). Moving Proc.WaitForExit() to after the for-loop seems to resolve the issue for them.publicoverride ProcessInf ...

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

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 ...

Memory Leak With NullRHI

Rendering - RHI - Apr 21, 2021

Crash when adding a pawn that has a SetSenseEnabled node set to true on Begin Play and then playing the game

Gameplay - AI - Apr 20, 2021

When adding the SetSenseEnabled node to a Pawn and controlling another pawn that has an AIPerceptionStiumuliSource, the editor crashes. I tested using other senses such as Hearing and the crash occu ...

There is a moment of T pause when Post Roll Frames is enabled and snapping is enabled

Anim - Sequencer - Apr 19, 2021

When I turn off snap, the problem does not occur The problem does not occur in 4.24.3 and 4.25.4 Occurs in 4.26.2 and UE4main ...

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

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 ...

Crash when adding a Material Layer with a Static Component Mask Parameter node to a Material Instance

Rendering - Apr 15, 2021

When adding a Material Layer, that has a Static Component Mask Parameter node in it, to a Material Instance, the editor will crash.   The ability to set Material Attribute layers in a Material Inst ...

Sphere Trace Distance Field GPU function hides necessary Collision DI input

Rendering - Niagara - Apr 14, 2021

The collision DI input is a hidden input, but is necessary for compilation. The input node should likely be marked as required, not hidden.  ...