Unreal Engine Issues
Unreal Engine Issues
Level asset "Diff against depot" opens P4 Merge tool
UE - World Creation - Worldbuilding Tools - Mar 1, 2024You can right click a level asset in the editor's Content Browser and do the action Source Control > Diff against Depot. However, this does not provide a useful diff window. It currently opens the d ...
Copying a Folder that contains the space character from the Outliner does not enclose the Folder name on Double Quotes. Because of that, later Pasting will only handle the first word of the Folder name.
UE - World Creation - Worldbuilding Tools - Jun 10, 2025Copying a Folder that contains the space character from the Outliner does not enclose the Folder name on Double Quotes. Because of that, later Pasting will only handle the first word of the Folder n ...
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 ...
Crash when opening a new level while opening Editor Utility Widget after opening and closing it multiple times
Tools - Jun 4, 2019Crash when opening a new level with reopened EditorUtilityWidget after opening and closing it multiple times. The cause of this issue is that UEditorUtilityWidgetBlueprint :: UpdateRespawnListIfNee ...
Changing MaterialQualityLevel causes a crash due to a ShaderMap mismatch in UniformExpressionCache
UE - Rendering - Architecture - Materials - Nov 26, 2025A crash may occur when changing the MaterialQualitylevel via Scalability due to a race condition. The issue occurs because in ScalabilityCVarsSinkCallback(), when it creates the FGlobalComponentRec ...
Editor crash on close if custom Data Asset is not saved after hot reload.
UE - Foundation - Core - Mar 7, 2016After creating an editor asset of a custom DataAsset class, if changes are made to to the class and hot reloaded, the editor will crash on close if the editor asset is not saved after the hot reload ...
Editor crashes when duplicating a Blueprint instance whose parent class overrides PreEditChange() without including a call to Super
UE - Gameplay - Blueprint - May 4, 2018Attempting to duplicate an instance of a Blueprint in a level where the parent code class has overridden PreEditChange() without including a call to Super results in the Editor crashing. ...
Mesh reduction crash with asset imported using FBX Scene Importer
UE - Graphics Features - Nov 30, 2016The editor will crash when using Mesh Reduction on an asset imported using the FBX Scene Import options. This same asset will not crash the editor if it has been imported using the normal Import opt ...
Using the "Convert Selected Components to Blueprint Class" feature on two blueprints will cause a crash
UE - Gameplay - Blueprint - Aug 12, 2015When trying to make a prefab (using the Convert Selected Components to Blueprint Class method )out of existing blueprints the editor will crash. ...
Editor ensure in USceneComponent::OnComponentDestroyed during Blueprint compilation GC
UE - Framework - Components - Jan 15, 2026An editor-only ensure can trigger during BP compilation when garbage collection cleans up transient components created as part of component replacement. During recompilation, old component instances ...