Unreal Engine Issues
Unreal Engine Issues
Artifacts appear on translucent particle systems during camera motion blur
UE - Rendering - Architecture - Jul 23, 2025Translucent particle systems exhibit visual artifacts when the camera moves, even though motion vectors are disabled for the particle emitters. While switching the Translucency Pass to "After Motio ...
Change uses of "OnlineSubsystemSteam" module name
UE - Online - Jun 19, 2025The refactor at CL 39638561 moved some classes, such as SteamNetDriver and SteamNetConnection, from the "OnlineSubsystemSteam" module to the new "SocketSubsystemSteamIP" module. There are still a f ...
Pasting a folder on the Outliner while LightMixer and ViewChanges windows are open/docked crashes the Editor
UE - CAPT - Tools - Jun 12, 2025When both LightMixer and ViewChanges windows are open, pasting a folder into the Outliner crashes the editor. For more detailed steps, refer to the Steps To Reproduce section. This happens whenever ...
Local lights appear broken when baking lighting with GPU Lightmass
UE - Rendering - Graphics Features - Jun 2, 2025Encountered an issue where local lights appear to be broken when baking lighting with GPU Lightmass. See screenshots attached. Tested regression in //UE5/Release-5.5 @ CL40574608 and the issue does ...
Search field in 'Quickly Add to Project' fails with Chinese Pinyin input unless manually focused
UE - AI Workflows - UI Systems - Localization - May 28, 2025A licensee reported that under the Chinese language setting in UE5, using the “Quickly Add to Project” button results in incorrect or ignored input when entering text via Pinyin IME. If the user sta ...
[CrashReport][GPUCrash] UpdateRadianceCaches
UE - Rendering - Graphics Features - Ray Tracing - May 19, 2025#31 crash out of 7783 in UE 5.7.4 on Windows#3 crash for UE - Rendering - Graphics Features in UE 5.7.4 on Windows#1 crash for UE - Rendering - Graphics Features - Ray Tracing in UE 5.7.4 on Windows ...
Changes to Instanced Properties default value on BP not propagated to placed actors in the opened level
UE - Core - Systems - May 15, 2025In UE versions 5.4 and onwards (as of CL 42589677 in Main), when an Instanced UObject property is defined in an Actor Blueprint, modifying the default value in the Blueprint does not propagate the c ...
ResavePackages commandlet (buildlighting) fails/asserts on reflection captures in non-visible sub-levels
UE - Rendering - Features - May 13, 2025When building reflection captures through the ResavePackages commandlet, it frequently triggers an ensure inside of ReflectionEnvironmentCapture.cpp. If distributed shader builds start causing prob ...
AssetRegistry: In a packaged game ScanPathsSynchronous with bForceRescan=true will permanently forget about assets inside IOStore containers
UE - Core - Data Pipeline - May 7, 2025This came up from several discussions on UDN and internal discussion. The root cause is that the AssetRegistry currently cannot discover packages inside IOStore containers, it relies on the seriali ...
Fields with Maximum resolution are not affecting all leaves of a Geometry Collection
UE - Runtime - Deformable - Apr 25, 2025Fields with Maximum resolution are not affecting all leaves of a Geometry Collection on 5.4 and onwards. When calling GetRelevantParticleHandles() a Maximum Resolution field does return all particl ...