Unreal Engine Issues
Unreal Engine Issues
[AI] UE_MT_SCOPED_READ_ACCESS(NavElementAccessDetector) Fails in editor on fresh sync
UE - AI - Navigation - Jan 27, 2025Licensees have reported failed multi-thread access code for NavElementAccessDetector in complex levels that have not finished compilation of their static meshes. The eventual failed check is inside ...
Some features have not yet been supported when using AmbientCubemap as IBL
UE - Graphics Features - Mar 26, 2025Translucent materials do not receive specular highlights and reflections from Ambient Cubemaps set in Post-Process settings. There is a pass"InjectTranslucencyLightingVolumeAmbientCubemap" that sho ...
In 5.6, bWarningsAsErrors does not work with clang
UE - Foundation - Cpp Tools - UnrealBuildTool - Sep 20, 2025In 5.6, many warnings and errors specify their command line arguments to the compiler with these new C# attributes: [WarningsClangToolChain(["-Wno-date-time"], ["-Wdate-time", "-Wno-error=date-ti ...
Automated tests DynamicSubobjectInstancing and NonNativeInstancedSubobjects (CoreUObject group) fail
UE - Framework - Dec 15, 2025The DynamicSubobjectInstancing and NonNativeInstancedSubobjects automation tests fail. ...
Console window is locked when casting to the player controller
UE - Editor - UI Systems - Jul 13, 2015User has reported that access to the console window is locked when using this setup. ...
Reset Emitter button in blueprint emitter component has no effect
UE - Gameplay - Blueprint - May 21, 2015After setting a particle system component inside blueprint, clicking the "Reset Emitter" button in the details panel does not have any effect on the particle system. ...
VC Runtime not in UnrealLightmass temp directory; causing lightmass build errors
UE - Foundation - Cpp Tools - UnrealBuildTool - Oct 14, 2015A Redistribute file for VS 2015 is needed to build lightmass, but this is not currently included with the engine. If a user does not have VS 2015 installed, lightmass will fail with this error: Un ...
CheckDefaultSubobjects() appears to not properly validate Blueprint Class instances
UE - Gameplay - Blueprint - May 17, 2016It looks like maybe CheckDefaultSubobjectsInternal() isn't set up to handle non-native (i.e. Blueprint) class types? As well as AActor::CheckActorComponents() perhaps? ...
Tooltip on Beam Source Name is incorrect
UE - Niagara - Oct 24, 2014In the Beam's Source Module the tooltip for the Source Name is actually the tooltip for the Source Tangent Strength. ...
Unable to see a Texture Format when using the Launch On feature
Tools - Jan 21, 2015When you Click the Arrow down to the right of the Launch On button, The texture format for an Android device is showing as a jumbled mix of numbers and letters and not in any specific format. ...