Unreal Engine Issues
Unreal Engine Issues
UPlacementSubsystem does not respect AssetFactories priorities, which is inconsistent with UEditorEngine::ActorFactories and makes it impossible to override placed actor type when dragging asset from Content Browser to Level Editor Viewport.
UE - Editor - Workflow Systems - Mar 30, 2026Note: This issue was reproduced in UE 5.7, and it works correctly in UE 4.27. Prior to CL 24938100 (between UE 5.1 and 5.2), all existing factories were discovered and registered during engine init ...
"Allow Sequencer Edits Only" and Control Rig performance impact
UE - Anim - Sequencer - Mar 27, 2026We noticed an issue working in sequencer with "Allow Seqeuncer Edits Only" and control rigs. Performance will drop when manipulating using the AnimDetails channel sliders. ...
Crash when switching from Lumen visualization to raytracing visualization
UE - Rendering - Graphics Features - Mar 27, 2026When switching from Lumen visualization to raytracing visualization via the console, the editor can crash to desktop. The crash appears to happen deep within the driver libraries, and does not trig ...
USD Export - crashes when sub level holds level instance
UE - Editor - Content Pipeline - USD - Mar 27, 2026The engine is crashing when the user tries to export from a persistent level with a sub level that contains a level instance. ...
Level Sequence SpotLight USD Exporter Bug
UE - Editor - Content Pipeline - USD - Mar 26, 2026The attributes for spotlights are not exported. ...
Chaos Fields: LS_MasterField continuously creates components every frame and never cleans them up
UE - Simulation - Visual - Mar 25, 2026While active and ticking, the built-in FS_MasterField actor instance continuously creates several new components every frame, which are never cleaned up until the actor is destroyed. This can happen ...
Renamed controls creating duplicate curves in sequencer that once fixed up cause selection issues.
UE - Anim - Rigging - Control Rig - Mar 25, 2026When a control is renamed after it has already been animated in a sequence, the control curve name map needs to be fixed up. Once it is fixed, selecting the control in the world will not map the sel ...
Dynamic Translucency Resolution Not Reported Correctly
UE - Rendering - Architecture - Mar 24, 2026The dynamic translucency resolution and other dynamic resolution values were tied to the primary dynamic resolution and never updated for each type of dynamic resolution. The scaling resolution fra ...
WorldPartitionChangelistValidator incorrectly flags actors referencing the level script actor as invalid
UE - World Creation - Worldbuilding Tools - World Partition - Mar 23, 2026When validating a change list that contains an actor that references the level script in the world (e.g. it has an event bound on the level script graph) it will fail changelist validation 100% of t ...
Editor crash in HairStrandsMeshProjection.cpp when spawning actor with Groom Component bound to skeletal mesh
UE - Rendering - Graphics Features - Mar 23, 2026The editor crashes with an assertion failure when placing a Blueprint actor that contains a Groom Component bound to a MetaHuman skeletal mesh. The crash occurs in AddHairStrandInitMeshSamplesPass d ...