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 ...
Reimporting mesh will wipe any collisions that were setup using the Static Mesh Editor
Tools - Jun 12, 2015When Reimporting a mesh the collision that is created using the methods in the Static Mesh Editor will be wiped if there was not previously setup UCX custom collision. ...
HideCategories() property is not held when the editor is closed
UE - Gameplay - Blueprint - Mar 20, 2015Setting a UCLASS() macro with the "HideCategories" property will updated after a hot reload but after closing /reopening the editor the hidden category will be visible again. ...
Child components of child actor components in blueprints do not update transform based on parent
UE - Gameplay - Nov 10, 2015If a blueprint has a child actor component that has other components parented to the child actor component, the child components of child actor components will not update transform based on the pare ...
Behavior Trees cannot be saved if the Blackboard assigned to it was opened before opening the Behavior Tree from the Content Browser
UE - AI - Nov 2, 2015Behavior Trees cannot be saved if the Blackboard assigned to it was opened before opening the Behavior Tree from the Content Browser. Reproduced in 4.8.3 binary, 4.9.2 binary, 4.10 Preview 3 binary ...
Graphics failure when pasting code for a BP node into Color Picker Hex field
Tools - Sep 11, 2015Graphics failure when pasting code for a BP node into Color Picker Hex field Does not occur in 4.8.3 ...
Moving or changing the name of a map that is set as the Game Default Map or Editor Startup Map does not update the map settings
Tools - Dec 4, 2014Moving or changing the name of a map that is set as the Game Default Map or Editor Startup Map does not update the map settings. These will still refer to the old name of the map, and the Editor and ...
Particle Events in Level Blueprints are not Triggering
UE - Gameplay - Dec 16, 2014Events like OnParticleSpawn, OnParticleCollide, and OnParticleDeath are not triggering in the level blueprint. ...
Maya navigation controls do not work as expected while Lock Viewport to Actor is enabled
Tools - Dec 16, 2014Maya navigation controls do not work as expected while Lock Viewport to Actor is enabled. The camera appears to behave the same as it would normally, but the actor the viewport is locked to is moved ...
Playing this project in Standalone, or packaging for windows, causes the new window to crash
UE - Gameplay - Dec 16, 2014When you attempt to play the user project in Standalone, or Packaging for Windows, the new window will crash and not play the game. Issue also occurs on Mobile. The project will not open. ...