Unreal Engine Issues
Unreal Engine Issues
Editor freezes when editing sub-level referenced by more than one level
Tools - Oct 12, 2017This bug occurs when more than one level references the sublevel. Occurs in 4.18P4 CL 3676890 Unable to reproduce in 4.17. This is a regression. ...
[CrashReport] Mac/Metal Intel compiler crash - UE4Editor-MetalRHI.dylib!CreateMTLRenderPipeline()
UE - Graphics Features - Oct 27, 2017Mark S: This is an Intel compiler failure on macOS 10.12.6. Callstack from LogAssertion failed: [File:/Users/build/Build/++UE4+Release-4.18+Compile/Sync/Engine/Source/Runtime/Apple/MetalRHI/Privat ...
Blutility button not working after editing blueprint - need to reopen window
UE - Gameplay - Blueprint Editor - Feb 28, 2018Blutility buttons are broken if graph is edited while panel is open. User reported bug Video repro attached ...
CSM receiver culling issue on Mobile
UE - Platform - Mobile - Apr 27, 2019Importing camera FBX into subsequence loses focal length
UE - Anim - Sequencer - Mar 27, 2020Importing a camera FBX into a sub sequence will not copy focal length animation. ...
Runtime float curves not applied in inherited blueprints
UE - Framework - Blueprint Runtime - Mar 13, 2023LevelSequenceActor sequencer loaded with DataLayer does not progress track when played
UE - Anim - Sequencer - Nov 1, 2023In UE5.2, there seems to be a problem with the initialization of the reloaded LevelSequenceActor. SequencePlayer->Initialize is not called in ALevelSequenceActor::InitializePlayer() and Tick regist ...
Substrate Add node only adds the first Substrate Slab's Emissive value when "Use Parameter Blending" is enabled
UE - Graphics Features - Substrate - Jan 10, 2025As per the steps to reproduce, the Substrate Add node only adds the first Substrate Slab's Emissive value when "Use Parameter Blending" is enabled. Leaving "Use Parameter Blending" unchecked on the ...
[Level Instances] Editor Actor Folders does a full refresh after any LI is loaded, leading to wasted time when bulk loading LIs for a given WP region load
UE - World Creation - Worldbuilding Tools - Level Instances - Jun 26, 2025From Licensee: We discovered a pretty big performance hit in editor when loading level instances for a world partition map, specifically: EditorActorFolders.cpp:FActorFolders::OnAllLevelsChanged() ...
Point Lights Invlidate Virtual Shadow Map Cache when at a distance from attenuation radius
UE - Graphics Features - Oct 28, 2025When the camera is outside of a certain distance from a point lights attenuation radius the VSM of that point light stops caching shadow maps. This can also be reflected in the output from the 'r.S ...