Unreal Engine Issues
Unreal Engine Issues
PropertyAccessUtil methods do not do propagation to instances when editing archetypes
UE - Editor - Workflow Systems - May 14, 2020Currently value propagation is handled at the property node level (c.f., PropagateContainerPropertyChange), and is unavailable to any other editor code / scripting (whether in Python or BP or C++). ...
Crash changing mesh paint material in blueprint, then changing to a different mode tab
Tools - Jul 11, 2016The editor crashes changing from mesh paint mode to another mode if the user has changed the material of an "Add Static Mesh Component" or "Add Spline Mesh Component" in a BP and compiled while in m ...
External reference error when trying to save Level Sequence Actor
UE - Anim - Sequencer - Feb 7, 2017External reference error when trying to save Level Sequence Actor after a change has been made. The error given is "Can't save ../../../.././../Users/YourUserName/Documents/Unreal Projects/YourProje ...
Editor-only blueprints like WidgetBlueprint are not added to cooked asset registry class hierarchy
UE - CoreTech - Aug 10, 2022Both the Asset Registry and Asset Manager look for all subclasses of UBlueprintCore and use that to search for blueprint classes and construct an inheritance hierarchy. This always works in editor b ...
Material Opacity Mask Not Working As Expected in PIE but Does in Standalone
UE - Graphics Features - Feb 5, 2019Material Mask Opacity is not working in PIE, but works as expected in Standalone. Found in 4.20 CL# 4369336, 4.21 CL# 4753647, 4.22 CL# 4862710, and 4.23 CL# 4898645 ...
LOD glitch when using Control Rig with Import Skeleton node
UE - Anim - Rigging - Control Rig - Aug 26, 2025In Unreal Engine 5.6 and Main, a glitch occurs when switching between LODs in a character setup that uses a Control Rig to dynamically load the skeleton hierarchy through the Import Skeleton node in ...
[Feature Request] FWebBrowserWindow::UnbindUObject of IOSPlatformWebBrowser.cpp is not implemented yet
UE - Platform - Mobile - May 23, 2018FWebBrowserWindow::UnbindUObject on iOS is not implemented yet. IOSPlatformWebBrowser void FWebBrowserWindow::BindUObject(const FString& Name, UObject* Object, bool bIsPermanent /*= true*/) { } ...
[AI] Unable to set StateTree asset to use in MassStateTreeTrait
UE - AI - StateTree - Dec 15, 2022You can no longer set the StateTree asset to use in a Mass Entity Config data asset. The list shows as empty even when making a new StateTree specifically using Mass Behavior schema. Attempts to add ...
IKeyArea::CreateCurveEditorModel is not adding custom property channel name.
UE - Anim - Sequencer - Nov 25, 2025When you have a custom float channel and run the above, It works great if it's a regular 'MovieScene3DTransformSection' : LogPython: [ {channel_name: "Location.Y", section: "/Script/MovieSceneTrack ...
ModularGameplay and other runtime plugins have wrong LoadingPhase
UE - Gameplay - Jun 30, 2022Plugins that provide blueprint-accessible libraries generally need to be set the PreDefault LoadingPhase so they can be properly loaded before game-specific data that loads early in the Default load ...