Unreal Engine Issues
Unreal Engine Issues
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 ...
Loading Duplicated Level via Python API Crashes Editor
UE - Editor - Workflow Systems - Feb 16, 2023When called from Python, in 5.1 the load level invocation results in a kernel panic style crash of the editor, with a message about the map leaking memory and not being able to be garbage collected ...
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. ...
Creating a blueprint from selected components crashes editor if components contain a blueprint with a component
UE - Gameplay - Blueprint - Nov 4, 2015Frequency: 2/2 Crash Reporter: [Link Removed] Editor crashes if the option: "Convert Selected Components to Blueprint Class" is selected from main editor viewport>Blueprints context menu. This occu ...
Editor crash on level load when bUseActorFolders is true after dragging Actor into another folder in the Outliner
UE - World Creation - Worldbuilding Tools - OFPA - Mar 7, 2023From licensee: Hello! Our level streaming setup enables the bUseActorFolders on our levels. When moving the Actor into another folder via the Outline, the editor will crash on the next load Assert ...
Renaming actors between levels during PIE causes issues
UE - World Creation - Worldbuilding Tools - OFPA - Dec 4, 2023When renaming actors during PIE the actor generates a new, non memory/temporary, actor package underneath the PIE world- this is then causing checks in EnumerateMemoryAssetsHelper (in AssetRegistry. ...
Landscape can be added as a source in take recorder
UE - Anim - Sequencer - Jan 25, 2021Landscapes should not be able to be animated in sequences, and should not appear as options for sources in take recorder. ...