Unreal Engine Issues
Unreal Engine Issues
Slate-based Program targets assert on start up
UE - Editor - UI Systems - Slate - May 20, 202013431468 (which originated from FN) has caused Program-type targets to assert when starting. This has been observed with both UnrealInsights and UnrealFrontend. check(PrimaryDockArea.IsValid()) ...
Creating a new Matinee Controller node only shows the Finished pin
UE - Gameplay - Blueprint - Dec 9, 2014Worked: P4 Main 4.7 CL:2375748 P4 Releases 4.6 CL:2369413 (Gold) Broken: Portal Binary 4.5.0 CL:2326478 After creating a matinee with event(s) in it, creating a Matinee Controller only shows the " ...
Translation Error during STEP import
UE - Editor - Content Pipeline - Datasmith - Importer - Mar 6, 2019Using plugin version 4.21E3. The attached STEP file was generated using Fusion 360 v2.0.5357. It is a very basic house model. On import, the assembly named 'mod_Upper Hall2_v5_1' has several compone ...
CitySample - Level MassCrowd - interactions with SmartObjects/ContextualAnimScene is broken in 5.5
UE - AI - Apr 9, 2025The 5.5 version of the CitySample project, particularly the MassCrowd scene, was not properly maintained. The previously working functionality of NPCs being able to sit on a bench is now broken. CAS ...
CharacterMovementComponent causes the Character to slide when jumping on moving objects
UE - Gameplay - Player Movement - Sep 21, 2018When the CharacterMovementComponent makes the transition from falling to walking, it retains the forward velocity it had while falling. When the character lands on the moving object, its new velocit ...
Crash in Skeletal Editor due to null ActorFactory reference
OLD - Anim - Feb 1, 2017When a material is dragged/dropped into a skeletal editor's bone hierarchy, the editor will crash due to null ActorFactory Regression: Yes - Crash does not occur in 4.13.2 binary (CL 3172292) ...
Engine crash when Scene Capture Component 2D is added to viewport with forward rendering
UE - Graphics Features - Nov 26, 2016If forward shading is enabled and shadows are disabled, adding an actor with a SceneCaptureComponent2D and static mesh to the viewport will cause the editor to crash. Regression: Yes - this crash o ...
FormatName is not added to the display name of gpu events in some cases.
UE - Metaverse - Profiling Tools - Dec 12, 2025If the breadcrumb events have no metadata but the metadata spec contains a format name, the format name is not added to the display name and the user cannot see it. GPU Profiler 2.0. The trace they ...
Light Function and Post Process domain material thumbnails show the default material
UE - Rendering - Architecture - Materials - Sep 25, 2026Since 5.8, materials whose Material Domain is Light Function or Post Process no longer preview correctly in the editor. They render as the default material (WorldGridMaterial) instead of the materia ...
DDC corruption creates incorrect pasted topology when using Landscape Copy / Paste Tool
UE - LD & Modeling - Terrain - Landscape - Apr 3, 2017I noticed that the copy and pasted section of the level was being painted while I was painting a nearby section of the level. This weird yellow color appeared and I undid and redid the paint to make ...