Unreal Engine Issues

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

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

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 ...

Occasional crash when attempting to in-app purchase on Android device

App is frequently terminated with a NullPointerException when attempt to request in-app purchase. It is assumed that product information cannot be retrieved if there is no Google account logged in t ...

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. ...

Memory Leak With NullRHI

Editor freezes when force deleting a level created with Conversion Suffix

Once force delete is initiated, editor was still non-responsive ~10 minutes later and had to be closed from Task Manager. Upon reopening the project, the level is still present in Content Browser an ...

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

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

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 ...

Adding a new component to a parent class breaks child Blueprints

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

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

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 ...