Unreal Engine Issues
Unreal Engine Issues
Editor crash while saving asset during cook operation
UE - Foundation - Data Pipeline - Cooker - Apr 2, 2025It is possible to experience an editor crash in 5.5.4 when the cook process generates a warning that references an asset while the editor is saving. It seems that during a save operation, the code t ...
Spawnable Level Instance via Sequencer in WP map
UE - World Creation - Worldbuilding Tools - Level Instances - Aug 21, 2023ULevelInstanceSubsystem::OnActorDeleted: check(!IsEditingLevelInstanceDirty(LevelInstance) && !HasDirtyChildrenLevelInstances(LevelInstance)); ...
"Build All Levels" does not re-AddNavigationSystemToWorld
UE - AI - Navigation - Feb 28, 2024The Build All Levels editor action cleans up the world's NavDataSet (UNavigationSystemV1::NavDataSet) as pre-rebuild world cleanup by calling: SetNavigationSystem(nullptr); inside UWorld::Cleanu ...
nDisplay is not linking correctly the Camera Components inside the nDisplayConfig.uasset with display viewports when their Projection Policy is set to Camera. This issue appears when a packaged game is launched from the Switchboard as "Packaged Game".
UE - Virtual Production - nDisplay - Jan 27, 2025When launching a packaged game from the nDisplay Switchboard, the nDisplayConfig file fails to link the cameras to the viewports. Inside the log generated by the Switchboard an error is displayed th ...
Crash when adding foliage instances to unloaded IFA
UE - World Creation - Worldbuilding Tools - Foliage - Aug 31, 2023Ran into a crash when trying to programmatically add foliage to a large WP level with some unloaded IFAs. ...
MRQ rendering crashes when there is an empty audio track
UE - Virtual Production - Tools - MRQ - Aug 25, 2025Fix up IOS errors calling UI API from non-UI threads
UE - Platform - Apple - Jul 27, 2020Motion Warping component disappears on Editor restart or when swapping engine versions.
UE - Anim - Gameplay - Nov 19, 2024Motion Warping component is disappearing on Editor restart or when swapping engine versions. When this occurs, the BP has the following Compiler Results messages: Component class is not set for'Mot ...
Crash when using StaticDuplicateObject with mismathced Source and Destination class types
UE - Foundation - Jun 19, 2025Starting in Unreal Engine 5.4, StaticDuplicateObject internally switched to using Unversioned Property Serialization (UPS) for performance reasons. However, UPS assumes the source and destination ob ...
Submix Level's minimum changes from -96dB to -60dB after making any changes to value
UE - Audio - Submixes - Mar 22, 2023Reproduces 3/3 times. Issue does not occur in //UE5/Release-5.1 - CL 23901901 Binary. Confirmed Regression. ...